54816621 has 4 divisors (see below), whose sum is σ = 73088832. Its totient is φ = 36544412.

The previous prime is 54816611. The next prime is 54816623. The reversal of 54816621 is 12661845.

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 54816621 - 2⁵ = 54816589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54816623) 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, 9136101 + ... + 9136106.

It is an arithmetic number, because the mean of its divisors is an integer number (18272208).

Almost surely, 2^54816621 is an apocalyptic number.

It is an amenable number.

54816621 is a deficient number, since it is larger than the sum of its proper divisors (18272211).

54816621 is a wasteful number, since it uses less digits than its factorization.

54816621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18272210.

The product of its digits is 11520, while the sum is 33.

The square root of 54816621 is about 7403.8247548142. The cubic root of 54816621 is about 379.8721199430.

The spelling of 54816621 in words is "fifty-four million, eight hundred sixteen thousand, six hundred twenty-one".