129902039 has 2 divisors, whose sum is σ = 129902040. Its totient is φ = 129902038.

The previous prime is 129902029. The next prime is 129902041. The reversal of 129902039 is 930209921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129902039 - 2⁴ = 129902023 is a prime.

It is a Sophie Germain prime.

Together with 129902041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129902009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64951019 + 64951020.

It is an arithmetic number, because the mean of its divisors is an integer number (64951020).

Almost surely, 2^129902039 is an apocalyptic number.

129902039 is a deficient number, since it is larger than the sum of its proper divisors (1).

129902039 is an equidigital number, since it uses as much as digits as its factorization.

129902039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 129902039 is about 11397.4575673700. The cubic root of 129902039 is about 506.4524262067.

The spelling of 129902039 in words is "one hundred twenty-nine million, nine hundred two thousand, thirty-nine".