656641131 has 8 divisors (see below), whose sum is σ = 883704384. Its totient is φ = 433669320.

The previous prime is 656641129. The next prime is 656641147. The reversal of 656641131 is 131146656.

656641131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 656641131 - 2¹ = 656641129 is a prime.

It is a super-2 number, since 2×656641131² = 862355149841918322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656641092 and 656641101.

It is not an unprimeable number, because it can be changed into a prime (656642131) 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, 1022485 + ... + 1023126.

It is an arithmetic number, because the mean of its divisors is an integer number (110463048).

Almost surely, 2^656641131 is an apocalyptic number.

656641131 is a deficient number, since it is larger than the sum of its proper divisors (227063253).

656641131 is a wasteful number, since it uses less digits than its factorization.

656641131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045721.

The product of its digits is 12960, while the sum is 33.

The square root of 656641131 is about 25625.0098731688. The cubic root of 656641131 is about 869.1792722387.

Adding to 656641131 its reverse (131146656), we get a palindrome (787787787).

It can be divided in two parts, 65664 and 1131, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 656641131 in words is "six hundred fifty-six million, six hundred forty-one thousand, one hundred thirty-one".