56871911 has 2 divisors, whose sum is σ = 56871912. Its totient is φ = 56871910.

The previous prime is 56871907. The next prime is 56871931. The reversal of 56871911 is 11917865.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56871911 - 2² = 56871907 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56871901) 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, 28435955 + 28435956.

It is an arithmetic number, because the mean of its divisors is an integer number (28435956).

Almost surely, 2^56871911 is an apocalyptic number.

56871911 is a deficient number, since it is larger than the sum of its proper divisors (1).

56871911 is an equidigital number, since it uses as much as digits as its factorization.

56871911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 56871911 is about 7541.3467630126. The cubic root of 56871911 is about 384.5616216821.

The spelling of 56871911 in words is "fifty-six million, eight hundred seventy-one thousand, nine hundred eleven".