129097799 has 8 divisors (see below), whose sum is σ = 137755440. Its totient is φ = 120626496.

The previous prime is 129097783. The next prime is 129097817. The reversal of 129097799 is 997790921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129097799 - 2⁴ = 129097783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129097799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129097729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45152 + ... + 47925.

It is an arithmetic number, because the mean of its divisors is an integer number (17219430).

Almost surely, 2^129097799 is an apocalyptic number.

129097799 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129097799 is a deficient number, since it is larger than the sum of its proper divisors (8657641).

129097799 is an equidigital number, since it uses as much as digits as its factorization.

129097799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93169.

The product of its (nonzero) digits is 642978, while the sum is 53.

The square root of 129097799 is about 11362.1212368114. The cubic root of 129097799 is about 505.4050914269.

Subtracting from 129097799 its product of nonzero digits (642978), we obtain a palindrome (128454821).

The spelling of 129097799 in words is "one hundred twenty-nine million, ninety-seven thousand, seven hundred ninety-nine".