55139 has 4 divisors (see below), whose sum is σ = 63024. Its totient is φ = 47256.

The previous prime is 55127. The next prime is 55147. The reversal of 55139 is 93155.

55139 = T₁₂₂ + T₁₂₃ + ... + T₁₂₈.

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 55139 - 2¹² = 51043 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 55139.

It is not an unprimeable number, because it can be changed into a prime (55109) 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, 3932 + ... + 3945.

It is an arithmetic number, because the mean of its divisors is an integer number (15756).

2⁵⁵¹³⁹ is an apocalyptic number.

55139 is a deficient number, since it is larger than the sum of its proper divisors (7885).

55139 is an equidigital number, since it uses as much as digits as its factorization.

55139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7884.

The product of its digits is 675, while the sum is 23.

The square root of 55139 is about 234.8169499845. The cubic root of 55139 is about 38.0615346502.

The spelling of 55139 in words is "fifty-five thousand, one hundred thirty-nine".