129401971 has 2 divisors, whose sum is σ = 129401972. Its totient is φ = 129401970.

The previous prime is 129401963. The next prime is 129401981. The reversal of 129401971 is 179104921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129401971 - 2³ = 129401963 is a prime.

It is not a weakly prime, because it can be changed into another prime (129401981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64700985 + 64700986.

It is an arithmetic number, because the mean of its divisors is an integer number (64700986).

Almost surely, 2^129401971 is an apocalyptic number.

129401971 is a deficient number, since it is larger than the sum of its proper divisors (1).

129401971 is an equidigital number, since it uses as much as digits as its factorization.

129401971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 129401971 is about 11375.4987143422. The cubic root of 129401971 is about 505.8017145042.

The spelling of 129401971 in words is "one hundred twenty-nine million, four hundred one thousand, nine hundred seventy-one".