54921913 has 4 divisors (see below), whose sum is σ = 57812560. Its totient is φ = 52031268.

The previous prime is 54921877. The next prime is 54921929. The reversal of 54921913 is 31912945.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31912945 = 5 ⋅6382589.

It is a cyclic number.

It is not a de Polignac number, because 54921913 - 2²⁵ = 21367481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54921943) 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, 1445295 + ... + 1445332.

It is an arithmetic number, because the mean of its divisors is an integer number (14453140).

Almost surely, 2^54921913 is an apocalyptic number.

It is an amenable number.

54921913 is a deficient number, since it is larger than the sum of its proper divisors (2890647).

54921913 is a wasteful number, since it uses less digits than its factorization.

54921913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890646.

The product of its digits is 9720, while the sum is 34.

The square root of 54921913 is about 7410.9319926714. The cubic root of 54921913 is about 380.1151843804.

The spelling of 54921913 in words is "fifty-four million, nine hundred twenty-one thousand, nine hundred thirteen".