56831560861 has 2 divisors, whose sum is σ = 56831560862. Its totient is φ = 56831560860.

The previous prime is 56831560829. The next prime is 56831560931. The reversal of 56831560861 is 16806513865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41032579225 + 15798981636 = 202565^2 + 125694^2 .

It is a cyclic number.

It is not a de Polignac number, because 56831560861 - 2⁵ = 56831560829 is a prime.

It is a super-2 number, since 2×56831560861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56831563861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28415780430 + 28415780431.

It is an arithmetic number, because the mean of its divisors is an integer number (28415780431).

Almost surely, 2^56831560861 is an apocalyptic number.

It is an amenable number.

56831560861 is a deficient number, since it is larger than the sum of its proper divisors (1).

56831560861 is an equidigital number, since it uses as much as digits as its factorization.

56831560861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 56831560861 in words is "fifty-six billion, eight hundred thirty-one million, five hundred sixty thousand, eight hundred sixty-one".