56979661 has 4 divisors (see below), whose sum is σ = 56996352.
Its totient is φ = 56962972.
The previous prime is 56979653. The next prime is 56979677. The reversal of 56979661 is 16697965.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 56979661 - 23 = 56979653 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (56979691) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165 + ... + 10738.
It is an arithmetic number, because the mean of its divisors is an integer number (14249088).
It is a 3414-hyperperfect number.
Almost surely, 256979661 is an apocalyptic number.
It is an amenable number.
56979661 is a deficient number, since it is larger than the sum of its proper divisors (16691).
56979661 is a wasteful number, since it uses less digits than its factorization.
56979661 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 16690.
The product of its digits is 612360, while the sum is 49.
The square root of 56979661 is about 7548.4873319096.
The cubic root of 56979661 is about 384.8043330245.
The spelling of 56979661 in words is "fifty-six million, nine hundred seventy-nine thousand, six hundred sixty-one".