79129289 has 2 divisors, whose sum is σ = 79129290. Its totient is φ = 79129288.

The previous prime is 79129283. The next prime is 79129291. The reversal of 79129289 is 98292197.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50055625 + 29073664 = 7075^2 + 5392^2 .

It is an emirp because it is prime and its reverse (98292197) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79129289 is a prime.

It is a super-2 number, since 2×79129289² = 12522888755291042, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 79129291, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (79129283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39564644 + 39564645.

It is an arithmetic number, because the mean of its divisors is an integer number (39564645).

Almost surely, 2^79129289 is an apocalyptic number.

It is an amenable number.

79129289 is a deficient number, since it is larger than the sum of its proper divisors (1).

79129289 is an equidigital number, since it uses as much as digits as its factorization.

79129289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 79129289 is about 8895.4645185060. The cubic root of 79129289 is about 429.3179904280.

The spelling of 79129289 in words is "seventy-nine million, one hundred twenty-nine thousand, two hundred eighty-nine".