54057991 has 4 divisors (see below), whose sum is σ = 58216312. Its totient is φ = 49899672.

The previous prime is 54057979. The next prime is 54058013. The reversal of 54057991 is 19975045.

54057991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 54057991 - 2⁷ = 54057863 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 (54057901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2079141 + ... + 2079166.

It is an arithmetic number, because the mean of its divisors is an integer number (14554078).

Almost surely, 2^54057991 is an apocalyptic number.

54057991 is a deficient number, since it is larger than the sum of its proper divisors (4158321).

54057991 is a wasteful number, since it uses less digits than its factorization.

54057991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4158320.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 54057991 is about 7352.4139573340. The cubic root of 54057991 is about 378.1115704176. Note that the first 3 decimals are identical.

The spelling of 54057991 in words is "fifty-four million, fifty-seven thousand, nine hundred ninety-one".