656538131 has 2 divisors, whose sum is σ = 656538132. Its totient is φ = 656538130.

The previous prime is 656538107. The next prime is 656538139. The reversal of 656538131 is 131835656.

656538131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656538131 - 2⁶ = 656538067 is a prime.

It is a super-2 number, since 2×656538131² = 862084634913946322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (656538139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328269065 + 328269066.

It is an arithmetic number, because the mean of its divisors is an integer number (328269066).

Almost surely, 2^656538131 is an apocalyptic number.

656538131 is a deficient number, since it is larger than the sum of its proper divisors (1).

656538131 is an equidigital number, since it uses as much as digits as its factorization.

656538131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 38.

The square root of 656538131 is about 25623.0000390274. Note that the first 4 decimals coincide. The cubic root of 656538131 is about 869.1338236965.

The spelling of 656538131 in words is "six hundred fifty-six million, five hundred thirty-eight thousand, one hundred thirty-one".