54591921 has 16 divisors (see below), whose sum is σ = 85134400. Its totient is φ = 34478784.

The previous prime is 54591917. The next prime is 54591931. The reversal of 54591921 is 12919545.

54591921 is a `hidden beast` number, since 545 + 91 + 9 + 21 = 666.

It is not a de Polignac number, because 54591921 - 2² = 54591917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54591931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52696 + ... + 53721.

It is an arithmetic number, because the mean of its divisors is an integer number (5320900).

Almost surely, 2^54591921 is an apocalyptic number.

It is an amenable number.

54591921 is a deficient number, since it is larger than the sum of its proper divisors (30542479).

54591921 is a wasteful number, since it uses less digits than its factorization.

54591921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106445 (or 106439 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 54591921 is about 7388.6345829253. The cubic root of 54591921 is about 379.3523617623.

The spelling of 54591921 in words is "fifty-four million, five hundred ninety-one thousand, nine hundred twenty-one".