129981913 has 2 divisors, whose sum is σ = 129981914. Its totient is φ = 129981912.

The previous prime is 129981899. The next prime is 129981923. The reversal of 129981913 is 319189921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83850649 + 46131264 = 9157^2 + 6792^2 .

It is a cyclic number.

It is not a de Polignac number, because 129981913 - 2²⁵ = 96427481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129981913.

It is not a weakly prime, because it can be changed into another prime (129981923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64990956 + 64990957.

It is an arithmetic number, because the mean of its divisors is an integer number (64990957).

Almost surely, 2^129981913 is an apocalyptic number.

It is an amenable number.

129981913 is a deficient number, since it is larger than the sum of its proper divisors (1).

129981913 is an equidigital number, since it uses as much as digits as its factorization.

129981913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 43.

The square root of 129981913 is about 11400.9610559812. The cubic root of 129981913 is about 506.5562072126.

The spelling of 129981913 in words is "one hundred twenty-nine million, nine hundred eighty-one thousand, nine hundred thirteen".