79979129 has 4 divisors (see below), whose sum is σ = 82737060. Its totient is φ = 77221200.

The previous prime is 79979117. The next prime is 79979131. The reversal of 79979129 is 92197997.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34105600 + 45873529 = 5840^2 + 6773^2 .

It is not a de Polignac number, because 79979129 - 2²⁴ = 63201913 is a prime.

It is a super-2 number, since 2×79979129² = 12793322151197282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79979429) 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, 1378922 + ... + 1378979.

It is an arithmetic number, because the mean of its divisors is an integer number (20684265).

Almost surely, 2^79979129 is an apocalyptic number.

It is an amenable number.

79979129 is a deficient number, since it is larger than the sum of its proper divisors (2757931).

79979129 is a wasteful number, since it uses less digits than its factorization.

79979129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757930.

The product of its digits is 642978, while the sum is 53.

The square root of 79979129 is about 8943.1051095243. The cubic root of 79979129 is about 430.8494637420.

It can be divided in two parts, 79979 and 129, that added together give a palindrome (80108).

The spelling of 79979129 in words is "seventy-nine million, nine hundred seventy-nine thousand, one hundred twenty-nine".