56561371 has 2 divisors, whose sum is σ = 56561372. Its totient is φ = 56561370.

The previous prime is 56561357. The next prime is 56561381. The reversal of 56561371 is 17316565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56561371 - 2⁷ = 56561243 is a prime.

It is not a weakly prime, because it can be changed into another prime (56561321) 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, 28280685 + 28280686.

It is an arithmetic number, because the mean of its divisors is an integer number (28280686).

Almost surely, 2^56561371 is an apocalyptic number.

56561371 is a deficient number, since it is larger than the sum of its proper divisors (1).

56561371 is an equidigital number, since it uses as much as digits as its factorization.

56561371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 34.

The square root of 56561371 is about 7520.7294194114. The cubic root of 56561371 is about 383.8603980209.

The spelling of 56561371 in words is "fifty-six million, five hundred sixty-one thousand, three hundred seventy-one".