54159991 has 4 divisors (see below), whose sum is σ = 54183472. Its totient is φ = 54136512.

The previous prime is 54159983. The next prime is 54159997. The reversal of 54159991 is 19995145.

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 54159991 - 2³ = 54159983 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 (54159997) 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, 7851 + ... + 13036.

It is an arithmetic number, because the mean of its divisors is an integer number (13545868).

Almost surely, 2^54159991 is an apocalyptic number.

54159991 is a deficient number, since it is larger than the sum of its proper divisors (23481).

54159991 is a wasteful number, since it uses less digits than its factorization.

54159991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23480.

The product of its digits is 72900, while the sum is 43.

The square root of 54159991 is about 7359.3471857224. The cubic root of 54159991 is about 378.3492358564.

The spelling of 54159991 in words is "fifty-four million, one hundred fifty-nine thousand, nine hundred ninety-one".