129058991 has 2 divisors, whose sum is σ = 129058992. Its totient is φ = 129058990.

The previous prime is 129058987. The next prime is 129059011. The reversal of 129058991 is 199850921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129058991 - 2² = 129058987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129058931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64529495 + 64529496.

It is an arithmetic number, because the mean of its divisors is an integer number (64529496).

Almost surely, 2^129058991 is an apocalyptic number.

129058991 is a deficient number, since it is larger than the sum of its proper divisors (1).

129058991 is an equidigital number, since it uses as much as digits as its factorization.

129058991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 129058991 is about 11360.4133287482. The cubic root of 129058991 is about 505.3544431932.

The spelling of 129058991 in words is "one hundred twenty-nine million, fifty-eight thousand, nine hundred ninety-one".