56991619 has 4 divisors (see below), whose sum is σ = 57009496. Its totient is φ = 56973744.

The previous prime is 56991601. The next prime is 56991647. The reversal of 56991619 is 91619965.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56991619 - 2⁵ = 56991587 is a prime.

It is a super-3 number, since 3×56991619³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56991679) 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, 2709 + ... + 11014.

It is an arithmetic number, because the mean of its divisors is an integer number (14252374).

Almost surely, 2^56991619 is an apocalyptic number.

56991619 is a deficient number, since it is larger than the sum of its proper divisors (17877).

56991619 is a wasteful number, since it uses less digits than its factorization.

56991619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17876.

The product of its digits is 131220, while the sum is 46.

The square root of 56991619 is about 7549.2793695822. The cubic root of 56991619 is about 384.8312500464.

The spelling of 56991619 in words is "fifty-six million, nine hundred ninety-one thousand, six hundred nineteen".