129761999 has 2 divisors, whose sum is σ = 129762000. Its totient is φ = 129761998.

The previous prime is 129761987. The next prime is 129762011. The reversal of 129761999 is 999167921.

It is a balanced prime because it is at equal distance from previous prime (129761987) and next prime (129762011).

It is an emirp because it is prime and its reverse (999167921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129761999 - 2⁸ = 129761743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129761999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129761909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64880999 + 64881000.

It is an arithmetic number, because the mean of its divisors is an integer number (64881000).

Almost surely, 2^129761999 is an apocalyptic number.

129761999 is a deficient number, since it is larger than the sum of its proper divisors (1).

129761999 is an equidigital number, since it uses as much as digits as its factorization.

129761999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 53.

The square root of 129761999 is about 11391.3124353606. The cubic root of 129761999 is about 506.2703682503.

The spelling of 129761999 in words is "one hundred twenty-nine million, seven hundred sixty-one thousand, nine hundred ninety-nine".