56056721 has 4 divisors (see below), whose sum is σ = 64064832. Its totient is φ = 48048612.

The previous prime is 56056697. The next prime is 56056751. The reversal of 56056721 is 12765065.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56056721 - 2¹⁴ = 56040337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56056751) 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, 4004045 + ... + 4004058.

It is an arithmetic number, because the mean of its divisors is an integer number (16016208).

Almost surely, 2^56056721 is an apocalyptic number.

It is an amenable number.

56056721 is a deficient number, since it is larger than the sum of its proper divisors (8008111).

56056721 is an equidigital number, since it uses as much as digits as its factorization.

56056721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8008110.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 56056721 is about 7487.1036456029. The cubic root of 56056721 is about 382.7153636459.

The spelling of 56056721 in words is "fifty-six million, fifty-six thousand, seven hundred twenty-one".