129386291 has 2 divisors, whose sum is σ = 129386292. Its totient is φ = 129386290.

The previous prime is 129386261. The next prime is 129386311. The reversal of 129386291 is 192683921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129386291 - 2⁶ = 129386227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (129386261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64693145 + 64693146.

It is an arithmetic number, because the mean of its divisors is an integer number (64693146).

Almost surely, 2^129386291 is an apocalyptic number.

129386291 is a deficient number, since it is larger than the sum of its proper divisors (1).

129386291 is an equidigital number, since it uses as much as digits as its factorization.

129386291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 129386291 is about 11374.8094929102. The cubic root of 129386291 is about 505.7812838745.

The spelling of 129386291 in words is "one hundred twenty-nine million, three hundred eighty-six thousand, two hundred ninety-one".