129316291 has 4 divisors (see below), whose sum is σ = 139263712. Its totient is φ = 119368872.

The previous prime is 129316273. The next prime is 129316301. The reversal of 129316291 is 192613921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129316291 - 2²¹ = 127219139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129316211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4973691 + ... + 4973716.

It is an arithmetic number, because the mean of its divisors is an integer number (34815928).

Almost surely, 2^129316291 is an apocalyptic number.

129316291 is a deficient number, since it is larger than the sum of its proper divisors (9947421).

129316291 is an equidigital number, since it uses as much as digits as its factorization.

129316291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9947420.

The product of its digits is 5832, while the sum is 34.

The square root of 129316291 is about 11371.7321020151. The cubic root of 129316291 is about 505.6900555681.

The spelling of 129316291 in words is "one hundred twenty-nine million, three hundred sixteen thousand, two hundred ninety-one".