This article assesses the properties of municipal sewage sludge stabilized using various stabilization technologies. Raw, stored, lime-stabilized, and stabilized sludge through aerobic composting were evaluated. The study assessed the chemical properties of the sludge, including pH and sorption capacity; available of P, K, and Mg; organic carbon and total nitrogen content; and selected heavy metals. The study revealed that the studied sewage sludge was characterized by a slightly acidic pH, high sorption capacity, and high content of available of P, K, and Mg, with low heavy metal content, qualifying it for agricultural use. The organic carbon content in lime- and aerobically stabilized sludge allows it to be classified as organic fertilizers, while stored sludge is classified as organic-mineral fertilizers. Stored sewage sludge had the lowest total nitrogen content and the highest carbon-to-nitrogen ratio. Raw sewage sludge has potential as an agricultural fertilizer, but its effectiveness and safety depend on its quality, processing method, and appropriate application. Pretreatment is recommended before agricultural application. Assessment of the properties of sewage sludge has shown that it can be used as a substitute for mineral fertilizers.