656331213 has 4 divisors (see below), whose sum is σ = 875108288. Its totient is φ = 437554140.

The previous prime is 656331211. The next prime is 656331227. The reversal of 656331213 is 312133656.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 656331213 - 2¹ = 656331211 is a prime.

It is a super-2 number, since 2×656331213² = 861541322316102738, 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 (656331211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109388533 + ... + 109388538.

It is an arithmetic number, because the mean of its divisors is an integer number (218777072).

Almost surely, 2^656331213 is an apocalyptic number.

It is an amenable number.

656331213 is a deficient number, since it is larger than the sum of its proper divisors (218777075).

656331213 is a wasteful number, since it uses less digits than its factorization.

656331213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218777074.

The product of its digits is 9720, while the sum is 30.

The square root of 656331213 is about 25618.9619813138. The cubic root of 656331213 is about 869.0425071781.

Adding to 656331213 its reverse (312133656), we get a palindrome (968464869).

The spelling of 656331213 in words is "six hundred fifty-six million, three hundred thirty-one thousand, two hundred thirteen".