56021761 has 2 divisors, whose sum is σ = 56021762. Its totient is φ = 56021760.

The previous prime is 56021753. The next prime is 56021773. The reversal of 56021761 is 16712065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 891136 = 7425^2 + 944^2 .

It is a cyclic number.

It is not a de Polignac number, because 56021761 - 2³ = 56021753 is a prime.

It is a super-2 number, since 2×56021761² = 6276875411082242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56021711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28010880 + 28010881.

It is an arithmetic number, because the mean of its divisors is an integer number (28010881).

Almost surely, 2^56021761 is an apocalyptic number.

It is an amenable number.

56021761 is a deficient number, since it is larger than the sum of its proper divisors (1).

56021761 is an equidigital number, since it uses as much as digits as its factorization.

56021761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 56021761 is about 7484.7686002975. The cubic root of 56021761 is about 382.6357864410.

The spelling of 56021761 in words is "fifty-six million, twenty-one thousand, seven hundred sixty-one".