56801561 has 2 divisors, whose sum is σ = 56801562. Its totient is φ = 56801560.

The previous prime is 56801527. The next prime is 56801567. The reversal of 56801561 is 16510865.

It is a happy number.

56801561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51208336 + 5593225 = 7156^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 56801561 - 2⁶ = 56801497 is a prime.

It is not a weakly prime, because it can be changed into another prime (56801567) 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, 28400780 + 28400781.

It is an arithmetic number, because the mean of its divisors is an integer number (28400781).

Almost surely, 2^56801561 is an apocalyptic number.

It is an amenable number.

56801561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56801561 is an equidigital number, since it uses as much as digits as its factorization.

56801561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 56801561 is about 7536.6810334523. The cubic root of 56801561 is about 384.4029899286.

The spelling of 56801561 in words is "fifty-six million, eight hundred one thousand, five hundred sixty-one".