129428899 has 2 divisors, whose sum is σ = 129428900. Its totient is φ = 129428898.

The previous prime is 129428863. The next prime is 129428933. The reversal of 129428899 is 998824921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129428899 - 2⁷ = 129428771 is a prime.

It is not a weakly prime, because it can be changed into another prime (129428099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64714449 + 64714450.

It is an arithmetic number, because the mean of its divisors is an integer number (64714450).

Almost surely, 2^129428899 is an apocalyptic number.

129428899 is a deficient number, since it is larger than the sum of its proper divisors (1).

129428899 is an equidigital number, since it uses as much as digits as its factorization.

129428899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 52.

The square root of 129428899 is about 11376.6822492324. The cubic root of 129428899 is about 505.8367971329.

The spelling of 129428899 in words is "one hundred twenty-nine million, four hundred twenty-eight thousand, eight hundred ninety-nine".