129179249 has 2 divisors, whose sum is σ = 129179250. Its totient is φ = 129179248.

The previous prime is 129179213. The next prime is 129179257. The reversal of 129179249 is 942971921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 51739249 = 8800^2 + 7193^2 .

It is a cyclic number.

It is not a de Polignac number, because 129179249 - 2⁸ = 129178993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129179849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64589624 + 64589625.

It is an arithmetic number, because the mean of its divisors is an integer number (64589625).

Almost surely, 2^129179249 is an apocalyptic number.

It is an amenable number.

129179249 is a deficient number, since it is larger than the sum of its proper divisors (1).

129179249 is an equidigital number, since it uses as much as digits as its factorization.

129179249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 129179249 is about 11365.7049495401. The cubic root of 129179249 is about 505.5113586413.

The spelling of 129179249 in words is "one hundred twenty-nine million, one hundred seventy-nine thousand, two hundred forty-nine".