129681907 has 2 divisors, whose sum is σ = 129681908. Its totient is φ = 129681906.

The previous prime is 129681887. The next prime is 129681947. The reversal of 129681907 is 709186921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129681907 - 2¹⁵ = 129649139 is a prime.

It is not a weakly prime, because it can be changed into another prime (129681947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64840953 + 64840954.

It is an arithmetic number, because the mean of its divisors is an integer number (64840954).

Almost surely, 2^129681907 is an apocalyptic number.

129681907 is a deficient number, since it is larger than the sum of its proper divisors (1).

129681907 is an equidigital number, since it uses as much as digits as its factorization.

129681907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 129681907 is about 11387.7964066803. The cubic root of 129681907 is about 506.1661863585.

The spelling of 129681907 in words is "one hundred twenty-nine million, six hundred eighty-one thousand, nine hundred seven".