655504631 has 4 divisors (see below), whose sum is σ = 655557264. Its totient is φ = 655452000.

The previous prime is 655504613. The next prime is 655504643. The reversal of 655504631 is 136405556.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655504631 is a prime.

It is a super-2 number, since 2×655504631² = 859372642524892322, 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 = 655504591 and 655504600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655504601) 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, 4031 + ... + 36431.

It is an arithmetic number, because the mean of its divisors is an integer number (163889316).

Almost surely, 2^655504631 is an apocalyptic number.

655504631 is a deficient number, since it is larger than the sum of its proper divisors (52633).

655504631 is a wasteful number, since it uses less digits than its factorization.

655504631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52632.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 655504631 is about 25602.8246683838. The cubic root of 655504631 is about 868.6775305489.

The spelling of 655504631 in words is "six hundred fifty-five million, five hundred four thousand, six hundred thirty-one".