54699991 has 4 divisors (see below), whose sum is σ = 54714832. Its totient is φ = 54685152.

The previous prime is 54699979. The next prime is 54700001. The reversal of 54699991 is 19999645.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 19999645 = 5 ⋅3999929.

It is a cyclic number.

It is not a de Polignac number, because 54699991 - 2⁵ = 54699959 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 (54699961) 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, 2815 + ... + 10831.

It is an arithmetic number, because the mean of its divisors is an integer number (13678708).

Almost surely, 2^54699991 is an apocalyptic number.

54699991 is a deficient number, since it is larger than the sum of its proper divisors (14841).

54699991 is an equidigital number, since it uses as much as digits as its factorization.

54699991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14840.

The product of its digits is 787320, while the sum is 52.

The square root of 54699991 is about 7395.9442263987. The cubic root of 54699991 is about 379.6025183571.

The spelling of 54699991 in words is "fifty-four million, six hundred ninety-nine thousand, nine hundred ninety-one".