54391999 has 4 divisors (see below), whose sum is σ = 54548200. Its totient is φ = 54235800.

The previous prime is 54391943. The next prime is 54392029. The reversal of 54391999 is 99919345.

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 54391999 - 2⁹ = 54391487 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 (54331999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77577 + ... + 78274.

It is an arithmetic number, because the mean of its divisors is an integer number (13637050).

Almost surely, 2^54391999 is an apocalyptic number.

54391999 is a deficient number, since it is larger than the sum of its proper divisors (156201).

54391999 is a wasteful number, since it uses less digits than its factorization.

54391999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156200.

The product of its digits is 393660, while the sum is 49.

The square root of 54391999 is about 7375.0931519541. The cubic root of 54391999 is about 378.8887177548. Note that the first 3 decimals are identical.

The spelling of 54391999 in words is "fifty-four million, three hundred ninety-one thousand, nine hundred ninety-nine".