656531013 has 4 divisors (see below), whose sum is σ = 875374688. Its totient is φ = 437687340.

The previous prime is 656530999. The next prime is 656531023. The reversal of 656531013 is 310135656.

656531013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 656531013 - 2¹⁰ = 656529989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656531023) 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, 109421833 + ... + 109421838.

It is an arithmetic number, because the mean of its divisors is an integer number (218843672).

Almost surely, 2^656531013 is an apocalyptic number.

It is an amenable number.

656531013 is a deficient number, since it is larger than the sum of its proper divisors (218843675).

656531013 is a wasteful number, since it uses less digits than its factorization.

656531013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218843674.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 656531013 is about 25622.8611400054. The cubic root of 656531013 is about 869.1306827178.

Adding to 656531013 its reverse (310135656), we get a palindrome (966666669).

It can be divided in two parts, 65653 and 1013, that added together give a palindrome (66666).

The spelling of 656531013 in words is "six hundred fifty-six million, five hundred thirty-one thousand, thirteen".