129179213 has 2 divisors, whose sum is σ = 129179214. Its totient is φ = 129179212.

The previous prime is 129179207. The next prime is 129179249. The reversal of 129179213 is 312971921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101163364 + 28015849 = 10058^2 + 5293^2 .

It is a cyclic number.

It is not a de Polignac number, because 129179213 - 2¹² = 129175117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129179203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64589606 + 64589607.

It is an arithmetic number, because the mean of its divisors is an integer number (64589607).

Almost surely, 2^129179213 is an apocalyptic number.

It is an amenable number.

129179213 is a deficient number, since it is larger than the sum of its proper divisors (1).

129179213 is an equidigital number, since it uses as much as digits as its factorization.

129179213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 129179213 is about 11365.7033658283. The cubic root of 129179213 is about 505.5113116822.

The spelling of 129179213 in words is "one hundred twenty-nine million, one hundred seventy-nine thousand, two hundred thirteen".