129071993 has 2 divisors, whose sum is σ = 129071994. Its totient is φ = 129071992.

The previous prime is 129071963. The next prime is 129072029. The reversal of 129071993 is 399170921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81144064 + 47927929 = 9008^2 + 6923^2 .

It is an emirp because it is prime and its reverse (399170921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129071993 - 2⁸ = 129071737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129071993.

It is not a weakly prime, because it can be changed into another prime (129071903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64535996 + 64535997.

It is an arithmetic number, because the mean of its divisors is an integer number (64535997).

Almost surely, 2^129071993 is an apocalyptic number.

It is an amenable number.

129071993 is a deficient number, since it is larger than the sum of its proper divisors (1).

129071993 is an equidigital number, since it uses as much as digits as its factorization.

129071993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 129071993 is about 11360.9855646418. The cubic root of 129071993 is about 505.3714132051.

The spelling of 129071993 in words is "one hundred twenty-nine million, seventy-one thousand, nine hundred ninety-three".