56691491 has 8 divisors (see below), whose sum is σ = 58877280. Its totient is φ = 54521152.

The previous prime is 56691473. The next prime is 56691493. The reversal of 56691491 is 19419665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56691491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56691493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3911 + ... + 11343.

It is an arithmetic number, because the mean of its divisors is an integer number (7359660).

Almost surely, 2^56691491 is an apocalyptic number.

56691491 is a deficient number, since it is larger than the sum of its proper divisors (2185789).

56691491 is a wasteful number, since it uses less digits than its factorization.

56691491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7725.

The product of its digits is 58320, while the sum is 41.

The square root of 56691491 is about 7529.3752064829. The cubic root of 56691491 is about 384.1545308133.

The spelling of 56691491 in words is "fifty-six million, six hundred ninety-one thousand, four hundred ninety-one".