54579991 has 4 divisors (see below), whose sum is σ = 54702000. Its totient is φ = 54457984.

The previous prime is 54579953. The next prime is 54580021. The reversal of 54579991 is 19997545.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54579991 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 (54529991) 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, 60331 + ... + 61228.

It is an arithmetic number, because the mean of its divisors is an integer number (13675500).

Almost surely, 2^54579991 is an apocalyptic number.

54579991 is a deficient number, since it is larger than the sum of its proper divisors (122009).

54579991 is a wasteful number, since it uses less digits than its factorization.

54579991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122008.

The product of its digits is 510300, while the sum is 49.

The square root of 54579991 is about 7387.8272177955. The cubic root of 54579991 is about 379.3247263949.

The spelling of 54579991 in words is "fifty-four million, five hundred seventy-nine thousand, nine hundred ninety-one".