129870971 has 2 divisors, whose sum is σ = 129870972. Its totient is φ = 129870970.

The previous prime is 129870967. The next prime is 129871031. The reversal of 129870971 is 179078921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129870971 - 2² = 129870967 is a prime.

It is not a weakly prime, because it can be changed into another prime (129870271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64935485 + 64935486.

It is an arithmetic number, because the mean of its divisors is an integer number (64935486).

Almost surely, 2^129870971 is an apocalyptic number.

129870971 is a deficient number, since it is larger than the sum of its proper divisors (1).

129870971 is an equidigital number, since it uses as much as digits as its factorization.

129870971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 129870971 is about 11396.0945503273. The cubic root of 129870971 is about 506.4120477835.

The spelling of 129870971 in words is "one hundred twenty-nine million, eight hundred seventy thousand, nine hundred seventy-one".