656129923 has 2 divisors, whose sum is σ = 656129924. Its totient is φ = 656129922.

The previous prime is 656129893. The next prime is 656129933. The reversal of 656129923 is 329921656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656129923 - 2²⁹ = 119259011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656129923.

It is not a weakly prime, because it can be changed into another prime (656129933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328064961 + 328064962.

It is an arithmetic number, because the mean of its divisors is an integer number (328064962).

Almost surely, 2^656129923 is an apocalyptic number.

656129923 is a deficient number, since it is larger than the sum of its proper divisors (1).

656129923 is an equidigital number, since it uses as much as digits as its factorization.

656129923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 43.

The square root of 656129923 is about 25615.0331446204. The cubic root of 656129923 is about 868.9536559757.

The spelling of 656129923 in words is "six hundred fifty-six million, one hundred twenty-nine thousand, nine hundred twenty-three".