129663799 has 4 divisors (see below), whose sum is σ = 133168264. Its totient is φ = 126159336.

The previous prime is 129663767. The next prime is 129663803. The reversal of 129663799 is 997366921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129663799 - 2⁵ = 129663767 is a prime.

It is a super-2 number, since 2×129663799² = 33625401542224802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129663739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1752177 + ... + 1752250.

It is an arithmetic number, because the mean of its divisors is an integer number (33292066).

Almost surely, 2^129663799 is an apocalyptic number.

129663799 is a deficient number, since it is larger than the sum of its proper divisors (3504465).

129663799 is an equidigital number, since it uses as much as digits as its factorization.

129663799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504464.

The product of its digits is 1102248, while the sum is 52.

The square root of 129663799 is about 11387.0013172916. The cubic root of 129663799 is about 506.1426259298.

The spelling of 129663799 in words is "one hundred twenty-nine million, six hundred sixty-three thousand, seven hundred ninety-nine".