56021057 has 4 divisors (see below), whose sum is σ = 56165460. Its totient is φ = 55876656.

The previous prime is 56021051. The next prime is 56021083. The reversal of 56021057 is 75012065.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14753281 + 41267776 = 3841^2 + 6424^2 .

It is a cyclic number.

It is not a de Polignac number, because 56021057 - 2⁴ = 56021041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71618 + ... + 72395.

It is an arithmetic number, because the mean of its divisors is an integer number (14041365).

Almost surely, 2^56021057 is an apocalyptic number.

It is an amenable number.

56021057 is a deficient number, since it is larger than the sum of its proper divisors (144403).

56021057 is a wasteful number, since it uses less digits than its factorization.

56021057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144402.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 56021057 is about 7484.7215713078. The cubic root of 56021057 is about 382.6341836309.

The spelling of 56021057 in words is "fifty-six million, twenty-one thousand, fifty-seven".