553581 has 32 divisors (see below), whose sum is σ = 979200. Its totient is φ = 302400.

The previous prime is 553573. The next prime is 553583. The reversal of 553581 is 185355.

553581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 553581 - 2³ = 553573 is a prime.

It is a super-2 number, since 2×553581² = 612903847122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 553581.

It is not an unprimeable number, because it can be changed into a prime (553583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5431 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (30600).

2⁵⁵³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

553581 is a deficient number, since it is larger than the sum of its proper divisors (425619).

553581 is a wasteful number, since it uses less digits than its factorization.

553581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 140 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 553581 is about 744.0302413209. The cubic root of 553581 is about 82.1095600756.

553581 divided by its sum of digits (27) gives a triangular number (20503 = T₂₀₂).

The spelling of 553581 in words is "five hundred fifty-three thousand, five hundred eighty-one".