54139881 has 16 divisors (see below), whose sum is σ = 74176256. Its totient is φ = 35105616.

The previous prime is 54139867. The next prime is 54139903. The reversal of 54139881 is 18893145.

It is not a de Polignac number, because 54139881 - 2⁹ = 54139369 is a prime.

It is a super-2 number, since 2×54139881² = 5862253429388322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54139801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35766 + ... + 37248.

It is an arithmetic number, because the mean of its divisors is an integer number (4636016).

Almost surely, 2^54139881 is an apocalyptic number.

It is an amenable number.

54139881 is a deficient number, since it is larger than the sum of its proper divisors (20036375).

54139881 is a wasteful number, since it uses less digits than its factorization.

54139881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812.

The product of its digits is 34560, while the sum is 39.

The square root of 54139881 is about 7357.9807692056. The cubic root of 54139881 is about 378.3024021150.

The spelling of 54139881 in words is "fifty-four million, one hundred thirty-nine thousand, eight hundred eighty-one".