656631231 has 8 divisors (see below), whose sum is σ = 885345840. Its totient is φ = 432835392.

The previous prime is 656631211. The next prime is 656631233. The reversal of 656631231 is 132136656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656631231 - 2⁶ = 656631167 is a prime.

It is a super-2 number, since 2×656631231² = 862329147049150722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656631192 and 656631201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656631233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1229380 + ... + 1229913.

It is an arithmetic number, because the mean of its divisors is an integer number (110668230).

Almost surely, 2^656631231 is an apocalyptic number.

656631231 is a deficient number, since it is larger than the sum of its proper divisors (228714609).

656631231 is a wasteful number, since it uses less digits than its factorization.

656631231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459385.

The product of its digits is 19440, while the sum is 33.

The square root of 656631231 is about 25624.8167017834. The cubic root of 656631231 is about 869.1749040901.

Adding to 656631231 its reverse (132136656), we get a palindrome (788767887).

The spelling of 656631231 in words is "six hundred fifty-six million, six hundred thirty-one thousand, two hundred thirty-one".