56116621 has 4 divisors (see below), whose sum is σ = 61218144. Its totient is φ = 51015100.

The previous prime is 56116597. The next prime is 56116639. The reversal of 56116621 is 12661165.

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 56116621 - 2¹⁷ = 55985549 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 56116621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56116661) 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, 2550745 + ... + 2550766.

It is an arithmetic number, because the mean of its divisors is an integer number (15304536).

Almost surely, 2^56116621 is an apocalyptic number.

It is an amenable number.

56116621 is a deficient number, since it is larger than the sum of its proper divisors (5101523).

56116621 is a wasteful number, since it uses less digits than its factorization.

56116621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5101522.

The product of its digits is 2160, while the sum is 28.

The square root of 56116621 is about 7491.1027893095. The cubic root of 56116621 is about 382.8516332983.

Adding to 56116621 its reverse (12661165), we get a palindrome (68777786).

The spelling of 56116621 in words is "fifty-six million, one hundred sixteen thousand, six hundred twenty-one".