656129893 has 2 divisors, whose sum is σ = 656129894. Its totient is φ = 656129892.

The previous prime is 656129797. The next prime is 656129923. The reversal of 656129893 is 398921656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655462404 + 667489 = 25602^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 656129893 - 2⁹ = 656129381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656129393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328064946 + 328064947.

It is an arithmetic number, because the mean of its divisors is an integer number (328064947).

Almost surely, 2^656129893 is an apocalyptic number.

It is an amenable number.

656129893 is a deficient number, since it is larger than the sum of its proper divisors (1).

656129893 is an equidigital number, since it uses as much as digits as its factorization.

656129893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 656129893 is about 25615.0325590267. The cubic root of 656129893 is about 868.9536427321.

The spelling of 656129893 in words is "six hundred fifty-six million, one hundred twenty-nine thousand, eight hundred ninety-three".