56017121 has 4 divisors (see below), whose sum is σ = 58452672. Its totient is φ = 53581572.

The previous prime is 56017109. The next prime is 56017123. The reversal of 56017121 is 12171065.

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 56017121 - 2¹⁰ = 56016097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 2435527 = 56017121 / (5 + 6 + 0 + 1 + 7 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56017123) 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, 1217741 + ... + 1217786.

It is an arithmetic number, because the mean of its divisors is an integer number (14613168).

Almost surely, 2^56017121 is an apocalyptic number.

It is an amenable number.

56017121 is a deficient number, since it is larger than the sum of its proper divisors (2435551).

56017121 is a wasteful number, since it uses less digits than its factorization.

56017121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435550.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 56017121 is about 7484.4586310568. The cubic root of 56017121 is about 382.6252222183.

Adding to 56017121 its reverse (12171065), we get a palindrome (68188186).

The spelling of 56017121 in words is "fifty-six million, seventeen thousand, one hundred twenty-one".