56021617 has 4 divisors (see below), whose sum is σ = 56036596. Its totient is φ = 56006640.

The previous prime is 56021599. The next prime is 56021639. The reversal of 56021617 is 71612065.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 23804641 + 32216976 = 4879^2 + 5676^2 .

It is a cyclic number.

It is not a de Polignac number, because 56021617 - 2⁷ = 56021489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56021657) 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, 3367 + ... + 11107.

It is an arithmetic number, because the mean of its divisors is an integer number (14009149).

Almost surely, 2^56021617 is an apocalyptic number.

It is an amenable number.

56021617 is a deficient number, since it is larger than the sum of its proper divisors (14979).

56021617 is an equidigital number, since it uses as much as digits as its factorization.

56021617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14978.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 56021617 is about 7484.7589807555. The cubic root of 56021617 is about 382.6354585946.

The spelling of 56021617 in words is "fifty-six million, twenty-one thousand, six hundred seventeen".