656129393 has 2 divisors, whose sum is σ = 656129394. Its totient is φ = 656129392.

The previous prime is 656129381. The next prime is 656129401. The reversal of 656129393 is 393921656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439657024 + 216472369 = 20968^2 + 14713^2 .

It is a cyclic number.

It is not a de Polignac number, because 656129393 - 2⁴ = 656129377 is a prime.

It is not a weakly prime, because it can be changed into another prime (656129323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328064696 + 328064697.

It is an arithmetic number, because the mean of its divisors is an integer number (328064697).

Almost surely, 2^656129393 is an apocalyptic number.

It is an amenable number.

656129393 is a deficient number, since it is larger than the sum of its proper divisors (1).

656129393 is an equidigital number, since it uses as much as digits as its factorization.

656129393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 44.

The square root of 656129393 is about 25615.0227991310. The cubic root of 656129393 is about 868.9534220050.

The spelling of 656129393 in words is "six hundred fifty-six million, one hundred twenty-nine thousand, three hundred ninety-three".