56561563 has 2 divisors, whose sum is σ = 56561564. Its totient is φ = 56561562.

The previous prime is 56561521. The next prime is 56561621. The reversal of 56561563 is 36516565.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56561563 - 2²¹ = 54464411 is a prime.

It is not a weakly prime, because it can be changed into another prime (56561663) 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, 28280781 + 28280782.

It is an arithmetic number, because the mean of its divisors is an integer number (28280782).

Almost surely, 2^56561563 is an apocalyptic number.

56561563 is a deficient number, since it is larger than the sum of its proper divisors (1).

56561563 is an equidigital number, since it uses as much as digits as its factorization.

56561563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 37.

The square root of 56561563 is about 7520.7421841199. The cubic root of 56561563 is about 383.8608323640.

It can be divided in two parts, 565 and 61563, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 56561563 in words is "fifty-six million, five hundred sixty-one thousand, five hundred sixty-three".