56018621 has 4 divisors (see below), whose sum is σ = 59313852. Its totient is φ = 52723392.

The previous prime is 56018617. The next prime is 56018653. The reversal of 56018621 is 12681065.

It is a happy number.

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 21031396 + 34987225 = 4586^2 + 5915^2 .

It is not a de Polignac number, because 56018621 - 2² = 56018617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56011621) 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, 1647590 + ... + 1647623.

It is an arithmetic number, because the mean of its divisors is an integer number (14828463).

Almost surely, 2^56018621 is an apocalyptic number.

It is an amenable number.

56018621 is a deficient number, since it is larger than the sum of its proper divisors (3295231).

56018621 is a wasteful number, since it uses less digits than its factorization.

56018621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295230.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 56018621 is about 7484.5588380345. The cubic root of 56018621 is about 382.6286374403.

Adding to 56018621 its reverse (12681065), we get a palindrome (68699686).

The spelling of 56018621 in words is "fifty-six million, eighteen thousand, six hundred twenty-one".