129418889 has 2 divisors, whose sum is σ = 129418890. Its totient is φ = 129418888.

The previous prime is 129418847. The next prime is 129418921. The reversal of 129418889 is 988814921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103327225 + 26091664 = 10165^2 + 5108^2 .

It is an emirp because it is prime and its reverse (988814921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129418889 - 2¹² = 129414793 is a prime.

It is a Chen prime.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (129418819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64709444 + 64709445.

It is an arithmetic number, because the mean of its divisors is an integer number (64709445).

Almost surely, 2^129418889 is an apocalyptic number.

It is an amenable number.

129418889 is a deficient number, since it is larger than the sum of its proper divisors (1).

129418889 is an equidigital number, since it uses as much as digits as its factorization.

129418889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 50.

The square root of 129418889 is about 11376.2423057880. The cubic root of 129418889 is about 505.8237563645.

The spelling of 129418889 in words is "one hundred twenty-nine million, four hundred eighteen thousand, eight hundred eighty-nine".