56445691 has 4 divisors (see below), whose sum is σ = 57288232. Its totient is φ = 55603152.

The previous prime is 56445667. The next prime is 56445707. The reversal of 56445691 is 19654465.

It is a happy number.

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 56445691 - 2⁵ = 56445659 is a prime.

It is a super-2 number, since 2×56445691² = 6372232064934962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56445791) 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 in 3 ways as a sum of consecutive naturals, for example, 421170 + ... + 421303.

It is an arithmetic number, because the mean of its divisors is an integer number (14322058).

Almost surely, 2^56445691 is an apocalyptic number.

56445691 is a deficient number, since it is larger than the sum of its proper divisors (842541).

56445691 is an equidigital number, since it uses as much as digits as its factorization.

56445691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842540.

The product of its digits is 129600, while the sum is 40.

The square root of 56445691 is about 7513.0347397041. The cubic root of 56445691 is about 383.5985274367.

The spelling of 56445691 in words is "fifty-six million, four hundred forty-five thousand, six hundred ninety-one".