129178913 has 2 divisors, whose sum is σ = 129178914. Its totient is φ = 129178912.

The previous prime is 129178909. The next prime is 129178921. The reversal of 129178913 is 319871921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96196864 + 32982049 = 9808^2 + 5743^2 .

It is a cyclic number.

It is not a de Polignac number, because 129178913 - 2² = 129178909 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129178993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64589456 + 64589457.

It is an arithmetic number, because the mean of its divisors is an integer number (64589457).

Almost surely, 2^129178913 is an apocalyptic number.

It is an amenable number.

129178913 is a deficient number, since it is larger than the sum of its proper divisors (1).

129178913 is an equidigital number, since it uses as much as digits as its factorization.

129178913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 41.

The square root of 129178913 is about 11365.6901682212. The cubic root of 129178913 is about 505.5109203563.

The spelling of 129178913 in words is "one hundred twenty-nine million, one hundred seventy-eight thousand, nine hundred thirteen".