557631 has 16 divisors (see below), whose sum is σ = 870400. Its totient is φ = 351864.

The previous prime is 557611. The next prime is 557633. The reversal of 557631 is 136755.

It is not a de Polignac number, because 557631 - 2⁶ = 557567 is a prime.

It is a super-2 number, since 2×557631² = 621904664322, which contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 557595 and 557604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31 + ... + 1056.

It is an arithmetic number, because the mean of its divisors is an integer number (54400).

2⁵⁵⁷⁶³¹ is an apocalyptic number.

557631 is a deficient number, since it is larger than the sum of its proper divisors (312769).

557631 is a wasteful number, since it uses less digits than its factorization.

557631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115 (or 1109 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 557631 is about 746.7469450892. The cubic root of 557631 is about 82.3093116536.

The spelling of 557631 in words is "five hundred fifty-seven thousand, six hundred thirty-one".