79808129 has 4 divisors (see below), whose sum is σ = 81664176. Its totient is φ = 77952084.

The previous prime is 79808123. The next prime is 79808143. The reversal of 79808129 is 92180897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79808129 - 2¹² = 79804033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79808129.

It is not an unprimeable number, because it can be changed into a prime (79808123) 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, 927959 + ... + 928044.

It is an arithmetic number, because the mean of its divisors is an integer number (20416044).

Almost surely, 2^79808129 is an apocalyptic number.

It is an amenable number.

79808129 is a deficient number, since it is larger than the sum of its proper divisors (1856047).

79808129 is a wasteful number, since it uses less digits than its factorization.

79808129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856046.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 79808129 is about 8933.5395560774. The cubic root of 79808129 is about 430.5421842930.

The spelling of 79808129 in words is "seventy-nine million, eight hundred eight thousand, one hundred twenty-nine".