55079139 has 4 divisors (see below), whose sum is σ = 73438856. Its totient is φ = 36719424.

The previous prime is 55079131. The next prime is 55079153. The reversal of 55079139 is 93197055.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55079139 - 2³ = 55079131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55079097 and 55079106.

It is not an unprimeable number, because it can be changed into a prime (55079131) 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, 9179854 + ... + 9179859.

It is an arithmetic number, because the mean of its divisors is an integer number (18359714).

Almost surely, 2^55079139 is an apocalyptic number.

55079139 is a deficient number, since it is larger than the sum of its proper divisors (18359717).

55079139 is a wasteful number, since it uses less digits than its factorization.

55079139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18359716.

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 55079139 is about 7421.5321194481. The cubic root of 55079139 is about 380.4775597850.

The spelling of 55079139 in words is "fifty-five million, seventy-nine thousand, one hundred thirty-nine".