129953809171 has 2 divisors, whose sum is σ = 129953809172. Its totient is φ = 129953809170.

The previous prime is 129953809133. The next prime is 129953809177. The reversal of 129953809171 is 171908359921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129953809171 - 2⁷ = 129953809043 is a prime.

It is not a weakly prime, because it can be changed into another prime (129953809177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64976904585 + 64976904586.

It is an arithmetic number, because the mean of its divisors is an integer number (64976904586).

Almost surely, 2^129953809171 is an apocalyptic number.

129953809171 is a deficient number, since it is larger than the sum of its proper divisors (1).

129953809171 is an equidigital number, since it uses as much as digits as its factorization.

129953809171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 55.

The spelling of 129953809171 in words is "one hundred twenty-nine billion, nine hundred fifty-three million, eight hundred nine thousand, one hundred seventy-one".