129615671 has 2 divisors, whose sum is σ = 129615672. Its totient is φ = 129615670.

The previous prime is 129615641. The next prime is 129615677. The reversal of 129615671 is 176516921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129615671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129615677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64807835 + 64807836.

It is an arithmetic number, because the mean of its divisors is an integer number (64807836).

Almost surely, 2^129615671 is an apocalyptic number.

129615671 is a deficient number, since it is larger than the sum of its proper divisors (1).

129615671 is an equidigital number, since it uses as much as digits as its factorization.

129615671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 129615671 is about 11384.8878343179. The cubic root of 129615671 is about 506.0799956326.

The spelling of 129615671 in words is "one hundred twenty-nine million, six hundred fifteen thousand, six hundred seventy-one".