129740291 has 2 divisors, whose sum is σ = 129740292. Its totient is φ = 129740290.

The previous prime is 129740269. The next prime is 129740293. The reversal of 129740291 is 192047921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129740291 - 2¹⁴ = 129723907 is a prime.

It is a Sophie Germain prime.

Together with 129740293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129740293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64870145 + 64870146.

It is an arithmetic number, because the mean of its divisors is an integer number (64870146).

Almost surely, 2^129740291 is an apocalyptic number.

129740291 is a deficient number, since it is larger than the sum of its proper divisors (1).

129740291 is an equidigital number, since it uses as much as digits as its factorization.

129740291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 129740291 is about 11390.3595641226. The cubic root of 129740291 is about 506.2421352027.

It can be divided in two parts, 129740 and 291, that added together give a palindrome (130031).

The spelling of 129740291 in words is "one hundred twenty-nine million, seven hundred forty thousand, two hundred ninety-one".