54521591 has 4 divisors (see below), whose sum is σ = 56280384. Its totient is φ = 52762800.

The previous prime is 54521581. The next prime is 54521603. The reversal of 54521591 is 19512545.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 54521591 - 2¹⁰ = 54520567 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 (54521501) 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, 879350 + ... + 879411.

It is an arithmetic number, because the mean of its divisors is an integer number (14070096).

Almost surely, 2^54521591 is an apocalyptic number.

54521591 is a deficient number, since it is larger than the sum of its proper divisors (1758793).

54521591 is a wasteful number, since it uses less digits than its factorization.

54521591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758792.

The product of its digits is 9000, while the sum is 32.

The square root of 54521591 is about 7383.8737123545. The cubic root of 54521591 is about 379.1893869947.

The spelling of 54521591 in words is "fifty-four million, five hundred twenty-one thousand, five hundred ninety-one".