129989957 has 2 divisors, whose sum is σ = 129989958. Its totient is φ = 129989956.

The previous prime is 129989927. The next prime is 129989969. The reversal of 129989957 is 759989921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91661476 + 38328481 = 9574^2 + 6191^2 .

It is a cyclic number.

It is not a de Polignac number, because 129989957 - 2²² = 125795653 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129989896 and 129989905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129989927) 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, 64994978 + 64994979.

It is an arithmetic number, because the mean of its divisors is an integer number (64994979).

Almost surely, 2^129989957 is an apocalyptic number.

It is an amenable number.

129989957 is a deficient number, since it is larger than the sum of its proper divisors (1).

129989957 is an equidigital number, since it uses as much as digits as its factorization.

129989957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 59.

The square root of 129989957 is about 11401.3138278007. The cubic root of 129989957 is about 506.5666564974.

The spelling of 129989957 in words is "one hundred twenty-nine million, nine hundred eighty-nine thousand, nine hundred fifty-seven".