129157291 has 2 divisors, whose sum is σ = 129157292. Its totient is φ = 129157290.

The previous prime is 129157289. The next prime is 129157297. The reversal of 129157291 is 192751921.

It is a weak prime.

It is an emirp because it is prime and its reverse (192751921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129157291 - 2¹ = 129157289 is a prime.

Together with 129157289, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 129157291.

It is not a weakly prime, because it can be changed into another prime (129157297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64578645 + 64578646.

It is an arithmetic number, because the mean of its divisors is an integer number (64578646).

Almost surely, 2^129157291 is an apocalyptic number.

129157291 is a deficient number, since it is larger than the sum of its proper divisors (1).

129157291 is an equidigital number, since it uses as much as digits as its factorization.

129157291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 37.

The square root of 129157291 is about 11364.7389323292. The cubic root of 129157291 is about 505.4827145995.

The spelling of 129157291 in words is "one hundred twenty-nine million, one hundred fifty-seven thousand, two hundred ninety-one".