129312791 has 2 divisors, whose sum is σ = 129312792. Its totient is φ = 129312790.

The previous prime is 129312731. The next prime is 129312889. The reversal of 129312791 is 197213921.

It is a weak prime.

It is an emirp because it is prime and its reverse (197213921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129312791 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129312731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64656395 + 64656396.

It is an arithmetic number, because the mean of its divisors is an integer number (64656396).

Almost surely, 2^129312791 is an apocalyptic number.

129312791 is a deficient number, since it is larger than the sum of its proper divisors (1).

129312791 is an equidigital number, since it uses as much as digits as its factorization.

129312791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 129312791 is about 11371.5782106091. The cubic root of 129312791 is about 505.6854932886.

The spelling of 129312791 in words is "one hundred twenty-nine million, three hundred twelve thousand, seven hundred ninety-one".