56018521 has 8 divisors (see below), whose sum is σ = 61155080. Its totient is φ = 51000192.

The previous prime is 56018489. The next prime is 56018527. The reversal of 56018521 is 12581065.

It can be written as a sum of positive squares in 4 ways, for example, as 68121 + 55950400 = 261^2 + 7480^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56018521 - 2⁵ = 56018489 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 56018521.

It is not an unprimeable number, because it can be changed into a prime (56018527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28566 + ... + 30463.

It is an arithmetic number, because the mean of its divisors is an integer number (7644385).

Almost surely, 2^56018521 is an apocalyptic number.

It is an amenable number.

56018521 is a deficient number, since it is larger than the sum of its proper divisors (5136559).

56018521 is a wasteful number, since it uses less digits than its factorization.

56018521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59115.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 56018521 is about 7484.5521576110. The cubic root of 56018521 is about 382.6284097608.

Adding to 56018521 its reverse (12581065), we get a palindrome (68599586).

The spelling of 56018521 in words is "fifty-six million, eighteen thousand, five hundred twenty-one".