56979691 has 2 divisors, whose sum is σ = 56979692. Its totient is φ = 56979690.

The previous prime is 56979683. The next prime is 56979719. The reversal of 56979691 is 19697965.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56979691 - 2³ = 56979683 is a prime.

It is not a weakly prime, because it can be changed into another prime (56979991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28489845 + 28489846.

It is an arithmetic number, because the mean of its divisors is an integer number (28489846).

Almost surely, 2^56979691 is an apocalyptic number.

56979691 is a deficient number, since it is larger than the sum of its proper divisors (1).

56979691 is an equidigital number, since it uses as much as digits as its factorization.

56979691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 52.

The square root of 56979691 is about 7548.4893190625. The cubic root of 56979691 is about 384.8044005581.

The spelling of 56979691 in words is "fifty-six million, nine hundred seventy-nine thousand, six hundred ninety-one".