79113209 has 16 divisors (see below), whose sum is σ = 93864960. Its totient is φ = 65249280.

The previous prime is 79113197. The next prime is 79113233. The reversal of 79113209 is 90231197.

Added to its reverse (90231197) it gives a triangular number (169344406 = T₁₈₄₀₃).

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 79113209 - 2²⁰ = 78064633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79113269) 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, 40937 + ... + 42825.

It is an arithmetic number, because the mean of its divisors is an integer number (5866560).

Almost surely, 2^79113209 is an apocalyptic number.

It is an amenable number.

79113209 is a deficient number, since it is larger than the sum of its proper divisors (14751751).

79113209 is a wasteful number, since it uses less digits than its factorization.

79113209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 79113209 is about 8894.5606412009. The cubic root of 79113209 is about 429.2889076402.

Adding to 79113209 its reverse (90231197), we get a triangular number (169344406 = T₁₈₄₀₃).

The spelling of 79113209 in words is "seventy-nine million, one hundred thirteen thousand, two hundred nine".