523556 has 24 divisors (see below), whose sum is σ = 1019424. Its totient is φ = 233280.

The previous prime is 523553. The next prime is 523571. The reversal of 523556 is 655325.

It is a super-2 number, since 2×523556² = 548221770272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (523553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3131 + ... + 3293.

It is an arithmetic number, because the mean of its divisors is an integer number (42476).

2⁵²³⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

523556 is a deficient number, since it is larger than the sum of its proper divisors (495868).

523556 is a wasteful number, since it uses less digits than its factorization.

523556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 249 counting only the distinct ones).

The product of its digits is 4500, while the sum is 26.

The square root of 523556 is about 723.5716965167. The cubic root of 523556 is about 80.5974027696.

Subtracting 523556 from its reverse (655325), we obtain a square (131769 = 363²).

The spelling of 523556 in words is "five hundred twenty-three thousand, five hundred fifty-six".