56491511 has 4 divisors (see below), whose sum is σ = 56579472. Its totient is φ = 56403552.

The previous prime is 56491499. The next prime is 56491531. The reversal of 56491511 is 11519465.

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 56491511 - 2¹⁰ = 56490487 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 (56491531) 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, 43010 + ... + 44303.

It is an arithmetic number, because the mean of its divisors is an integer number (14144868).

Almost surely, 2^56491511 is an apocalyptic number.

56491511 is a deficient number, since it is larger than the sum of its proper divisors (87961).

56491511 is an equidigital number, since it uses as much as digits as its factorization.

56491511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87960.

The product of its digits is 5400, while the sum is 32.

The square root of 56491511 is about 7516.0834880940. The cubic root of 56491511 is about 383.7022952084.

The spelling of 56491511 in words is "fifty-six million, four hundred ninety-one thousand, five hundred eleven".