56215771 has 2 divisors, whose sum is σ = 56215772. Its totient is φ = 56215770.

The previous prime is 56215759. The next prime is 56215781. The reversal of 56215771 is 17751265.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56215771 - 2²¹ = 54118619 is a prime.

It is not a weakly prime, because it can be changed into another prime (56215711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28107885 + 28107886.

It is an arithmetic number, because the mean of its divisors is an integer number (28107886).

Almost surely, 2^56215771 is an apocalyptic number.

56215771 is a deficient number, since it is larger than the sum of its proper divisors (1).

56215771 is an equidigital number, since it uses as much as digits as its factorization.

56215771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 34.

The square root of 56215771 is about 7497.7177194130. The cubic root of 56215771 is about 383.0769818921.

The spelling of 56215771 in words is "fifty-six million, two hundred fifteen thousand, seven hundred seventy-one".