56416561 has 2 divisors, whose sum is σ = 56416562. Its totient is φ = 56416560.

The previous prime is 56416519. The next prime is 56416573. The reversal of 56416561 is 16561465.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 1062961 = 7440^2 + 1031^2 .

It is a cyclic number.

It is not a de Polignac number, because 56416561 - 2¹³ = 56408369 is a prime.

It is not a weakly prime, because it can be changed into another prime (56416501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28208280 + 28208281.

It is an arithmetic number, because the mean of its divisors is an integer number (28208281).

Almost surely, 2^56416561 is an apocalyptic number.

It is an amenable number.

56416561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56416561 is an equidigital number, since it uses as much as digits as its factorization.

56416561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 56416561 is about 7511.0958587945. The cubic root of 56416561 is about 383.5325280209.

The spelling of 56416561 in words is "fifty-six million, four hundred sixteen thousand, five hundred sixty-one".