56921903 has 4 divisors (see below), whose sum is σ = 57005928. Its totient is φ = 56837880.

The previous prime is 56921897. The next prime is 56921911. The reversal of 56921903 is 30912965.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56921903 is a prime.

It is a super-2 number, since 2×56921903² = 6480206082282818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56921923) 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, 40988 + ... + 42353.

It is an arithmetic number, because the mean of its divisors is an integer number (14251482).

Almost surely, 2^56921903 is an apocalyptic number.

56921903 is a deficient number, since it is larger than the sum of its proper divisors (84025).

56921903 is an equidigital number, since it uses as much as digits as its factorization.

56921903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84024.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 56921903 is about 7544.6605622785. The cubic root of 56921903 is about 384.6742688214.

The spelling of 56921903 in words is "fifty-six million, nine hundred twenty-one thousand, nine hundred three".