56086721 has 2 divisors, whose sum is σ = 56086722. Its totient is φ = 56086720.

The previous prime is 56086717. The next prime is 56086739. The reversal of 56086721 is 12768065.

56086721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56085121 + 1600 = 7489^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 56086721 - 2² = 56086717 is a prime.

It is not a weakly prime, because it can be changed into another prime (56086741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28043360 + 28043361.

It is an arithmetic number, because the mean of its divisors is an integer number (28043361).

Almost surely, 2^56086721 is an apocalyptic number.

It is an amenable number.

56086721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56086721 is an equidigital number, since it uses as much as digits as its factorization.

56086721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 56086721 is about 7489.1068225790. The cubic root of 56086721 is about 382.7836243476.

The spelling of 56086721 in words is "fifty-six million, eighty-six thousand, seven hundred twenty-one".