129201913 has 2 divisors, whose sum is σ = 129201914. Its totient is φ = 129201912.

The previous prime is 129201901. The next prime is 129201959. The reversal of 129201913 is 319102921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122168809 + 7033104 = 11053^2 + 2652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129201913 is a prime.

It is not a weakly prime, because it can be changed into another prime (129201613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64600956 + 64600957.

It is an arithmetic number, because the mean of its divisors is an integer number (64600957).

Almost surely, 2^129201913 is an apocalyptic number.

It is an amenable number.

129201913 is a deficient number, since it is larger than the sum of its proper divisors (1).

129201913 is an equidigital number, since it uses as much as digits as its factorization.

129201913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 129201913 is about 11366.7019403167. The cubic root of 129201913 is about 505.5409202506.

The spelling of 129201913 in words is "one hundred twenty-nine million, two hundred one thousand, nine hundred thirteen".