56555861 has 2 divisors, whose sum is σ = 56555862. Its totient is φ = 56555860.

The previous prime is 56555789. The next prime is 56555867. The reversal of 56555861 is 16855565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38365636 + 18190225 = 6194^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 56555861 - 2²² = 52361557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56555867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28277930 + 28277931.

It is an arithmetic number, because the mean of its divisors is an integer number (28277931).

Almost surely, 2^56555861 is an apocalyptic number.

It is an amenable number.

56555861 is a deficient number, since it is larger than the sum of its proper divisors (1).

56555861 is an equidigital number, since it uses as much as digits as its factorization.

56555861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180000, while the sum is 41.

The square root of 56555861 is about 7520.3630896387. The cubic root of 56555861 is about 383.8479328618.

The spelling of 56555861 in words is "fifty-six million, five hundred fifty-five thousand, eight hundred sixty-one".