56541000721 has 2 divisors, whose sum is σ = 56541000722. Its totient is φ = 56541000720.

The previous prime is 56541000713. The next prime is 56541000739. The reversal of 56541000721 is 12700014565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56043933696 + 497067025 = 236736^2 + 22295^2 .

It is a cyclic number.

It is not a de Polignac number, because 56541000721 - 2³ = 56541000713 is a prime.

It is not a weakly prime, because it can be changed into another prime (56541000751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28270500360 + 28270500361.

It is an arithmetic number, because the mean of its divisors is an integer number (28270500361).

Almost surely, 2^56541000721 is an apocalyptic number.

It is an amenable number.

56541000721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56541000721 is an equidigital number, since it uses as much as digits as its factorization.

56541000721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 56541000721 in words is "fifty-six billion, five hundred forty-one million, seven hundred twenty-one", and thus it is an aban number.