79091039 has 4 divisors (see below), whose sum is σ = 79131024. Its totient is φ = 79051056.

The previous prime is 79091017. The next prime is 79091063. The reversal of 79091039 is 93019097.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79091039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79090993 and 79091011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79091539) 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 3 ways as a sum of consecutive naturals, for example, 16862 + ... + 21035.

It is an arithmetic number, because the mean of its divisors is an integer number (19782756).

Almost surely, 2^79091039 is an apocalyptic number.

79091039 is a deficient number, since it is larger than the sum of its proper divisors (39985).

79091039 is a wasteful number, since it uses less digits than its factorization.

79091039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39984.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 79091039 is about 8893.3142865863. The cubic root of 79091039 is about 429.2488038263.

The spelling of 79091039 in words is "seventy-nine million, ninety-one thousand, thirty-nine".