555631 has 4 divisors (see below), whose sum is σ = 563992. Its totient is φ = 547272.

The previous prime is 555593. The next prime is 555637. The reversal of 555631 is 136555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 555631 - 2⁹ = 555119 is a prime.

It is a super-2 number, since 2×555631² = 617451616322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 555596 and 555605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4080 + ... + 4213.

It is an arithmetic number, because the mean of its divisors is an integer number (140998).

2⁵⁵⁵⁶³¹ is an apocalyptic number.

555631 is a deficient number, since it is larger than the sum of its proper divisors (8361).

555631 is an equidigital number, since it uses as much as digits as its factorization.

555631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8360.

The product of its digits is 2250, while the sum is 25.

The square root of 555631 is about 745.4066004537. The cubic root of 555631 is about 82.2107902159.

The spelling of 555631 in words is "five hundred fifty-five thousand, six hundred thirty-one".