79931129 has 2 divisors, whose sum is σ = 79931130. Its totient is φ = 79931128.

The previous prime is 79931107. The next prime is 79931147. The reversal of 79931129 is 92113997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76038400 + 3892729 = 8720^2 + 1973^2 .

It is an emirp because it is prime and its reverse (92113997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79931129 - 2²⁰ = 78882553 is a prime.

It is not a weakly prime, because it can be changed into another prime (79931149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39965564 + 39965565.

It is an arithmetic number, because the mean of its divisors is an integer number (39965565).

Almost surely, 2^79931129 is an apocalyptic number.

It is an amenable number.

79931129 is a deficient number, since it is larger than the sum of its proper divisors (1).

79931129 is an equidigital number, since it uses as much as digits as its factorization.

79931129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 41.

The square root of 79931129 is about 8940.4210750948. The cubic root of 79931129 is about 430.7632541140.

The spelling of 79931129 in words is "seventy-nine million, nine hundred thirty-one thousand, one hundred twenty-nine".