656059421 has 2 divisors, whose sum is σ = 656059422. Its totient is φ = 656059420.

The previous prime is 656059399. The next prime is 656059433. The reversal of 656059421 is 124950656.

656059421 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 can be written as a sum of positive squares in only one way, i.e., 449016100 + 207043321 = 21190^2 + 14389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656059421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656059451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328029710 + 328029711.

It is an arithmetic number, because the mean of its divisors is an integer number (328029711).

Almost surely, 2^656059421 is an apocalyptic number.

It is an amenable number.

656059421 is a deficient number, since it is larger than the sum of its proper divisors (1).

656059421 is an equidigital number, since it uses as much as digits as its factorization.

656059421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 656059421 is about 25613.6569236023. The cubic root of 656059421 is about 868.9225314667.

The spelling of 656059421 in words is "six hundred fifty-six million, fifty-nine thousand, four hundred twenty-one".