129612971 has 2 divisors, whose sum is σ = 129612972. Its totient is φ = 129612970.

The previous prime is 129612941. The next prime is 129613061. The reversal of 129612971 is 179216921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129612971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129612941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64806485 + 64806486.

It is an arithmetic number, because the mean of its divisors is an integer number (64806486).

Almost surely, 2^129612971 is an apocalyptic number.

129612971 is a deficient number, since it is larger than the sum of its proper divisors (1).

129612971 is an equidigital number, since it uses as much as digits as its factorization.

129612971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 129612971 is about 11384.7692554570. The cubic root of 129612971 is about 506.0764815887.

The spelling of 129612971 in words is "one hundred twenty-nine million, six hundred twelve thousand, nine hundred seventy-one".