79581139 has 16 divisors (see below), whose sum is σ = 91687680. Its totient is φ = 68312160.

The previous prime is 79581137. The next prime is 79581163. The reversal of 79581139 is 93118597.

It is a cyclic number.

It is not a de Polignac number, because 79581139 - 2¹ = 79581137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79581095 and 79581104.

It is not an unprimeable number, because it can be changed into a prime (79581137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104749 + ... + 105505.

It is an arithmetic number, because the mean of its divisors is an integer number (5730480).

Almost surely, 2^79581139 is an apocalyptic number.

79581139 is a deficient number, since it is larger than the sum of its proper divisors (12106541).

79581139 is a wasteful number, since it uses less digits than its factorization.

79581139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290.

The product of its digits is 68040, while the sum is 43.

The square root of 79581139 is about 8920.8261388730. The cubic root of 79581139 is about 430.1336145078.

The spelling of 79581139 in words is "seventy-nine million, five hundred eighty-one thousand, one hundred thirty-nine".