56721107 has 4 divisors (see below), whose sum is σ = 56816400. Its totient is φ = 56625816.

The previous prime is 56721047. The next prime is 56721109. The reversal of 56721107 is 70112765.

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-56721107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56721107.

It is not an unprimeable number, because it can be changed into a prime (56721109) 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, 46748 + ... + 47945.

It is an arithmetic number, because the mean of its divisors is an integer number (14204100).

Almost surely, 2^56721107 is an apocalyptic number.

56721107 is a deficient number, since it is larger than the sum of its proper divisors (95293).

56721107 is an equidigital number, since it uses as much as digits as its factorization.

56721107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95292.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 56721107 is about 7531.3416467453. The cubic root of 56721107 is about 384.2214141015.

The spelling of 56721107 in words is "fifty-six million, seven hundred twenty-one thousand, one hundred seven".