655365631 has 4 divisors (see below), whose sum is σ = 656425000. Its totient is φ = 654306264.

The previous prime is 655365587. The next prime is 655365647. The reversal of 655365631 is 136563556.

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 655365631 - 2²¹ = 653268479 is a prime.

It is a super-2 number, since 2×655365631² = 859008220592056322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655365671) 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, 528756 + ... + 529993.

It is an arithmetic number, because the mean of its divisors is an integer number (164106250).

Almost surely, 2^655365631 is an apocalyptic number.

655365631 is a deficient number, since it is larger than the sum of its proper divisors (1059369).

655365631 is a wasteful number, since it uses less digits than its factorization.

655365631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059368.

The product of its digits is 243000, while the sum is 40.

The square root of 655365631 is about 25600.1099802325. The cubic root of 655365631 is about 868.6161250776.

The spelling of 655365631 in words is "six hundred fifty-five million, three hundred sixty-five thousand, six hundred thirty-one".