129701639 has 2 divisors, whose sum is σ = 129701640. Its totient is φ = 129701638.

The previous prime is 129701609. The next prime is 129701641. The reversal of 129701639 is 936107921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129701639 - 2²⁴ = 112924423 is a prime.

It is a Sophie Germain prime.

Together with 129701641, 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 (129701609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64850819 + 64850820.

It is an arithmetic number, because the mean of its divisors is an integer number (64850820).

Almost surely, 2^129701639 is an apocalyptic number.

129701639 is a deficient number, since it is larger than the sum of its proper divisors (1).

129701639 is an equidigital number, since it uses as much as digits as its factorization.

129701639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 129701639 is about 11388.6627397601. The cubic root of 129701639 is about 506.1918572864.

The spelling of 129701639 in words is "one hundred twenty-nine million, seven hundred one thousand, six hundred thirty-nine".