56390534521 has 2 divisors, whose sum is σ = 56390534522. Its totient is φ = 56390534520.

The previous prime is 56390534507. The next prime is 56390534567. The reversal of 56390534521 is 12543509365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53285258896 + 3105275625 = 230836^2 + 55725^2 .

It is a cyclic number.

It is not a de Polignac number, because 56390534521 - 2⁷ = 56390534393 is a prime.

It is not a weakly prime, because it can be changed into another prime (56390534021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28195267260 + 28195267261.

It is an arithmetic number, because the mean of its divisors is an integer number (28195267261).

Almost surely, 2^56390534521 is an apocalyptic number.

It is an amenable number.

56390534521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56390534521 is an equidigital number, since it uses as much as digits as its factorization.

56390534521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 56390534521 in words is "fifty-six billion, three hundred ninety million, five hundred thirty-four thousand, five hundred twenty-one".