656351231 has 4 divisors (see below), whose sum is σ = 656412192. Its totient is φ = 656290272.

The previous prime is 656351203. The next prime is 656351233. The reversal of 656351231 is 132153656.

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 not a de Polignac number, because 656351231 - 2¹⁸ = 656089087 is a prime.

It is a super-2 number, since 2×656351231² = 861593876870430722, 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 (656351233) 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, 9530 + ... + 37463.

It is an arithmetic number, because the mean of its divisors is an integer number (164103048).

Almost surely, 2^656351231 is an apocalyptic number.

656351231 is a deficient number, since it is larger than the sum of its proper divisors (60961).

656351231 is a wasteful number, since it uses less digits than its factorization.

656351231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60960.

The product of its digits is 16200, while the sum is 32.

The square root of 656351231 is about 25619.3526655144. The cubic root of 656351231 is about 869.0513423088.

It can be divided in two parts, 65635 and 1231, that added together give a palindrome (66866).

The spelling of 656351231 in words is "six hundred fifty-six million, three hundred fifty-one thousand, two hundred thirty-one".