129109995 has 48 divisors (see below), whose sum is σ = 260133120. Its totient is φ = 58012992.

The previous prime is 129109991. The next prime is 129109999. The reversal of 129109995 is 599901921.

It is an interprime number because it is at equal distance from previous prime (129109991) and next prime (129109999).

It is not a de Polignac number, because 129109995 - 2² = 129109991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129109995.

It is not an unprimeable number, because it can be changed into a prime (129109991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15112 + ... + 22058.

It is an arithmetic number, because the mean of its divisors is an integer number (5419440).

Almost surely, 2^129109995 is an apocalyptic number.

129109995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129109995 is an abundant number, since it is smaller than the sum of its proper divisors (131023125).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129109995 is a wasteful number, since it uses less digits than its factorization.

129109995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7024 (or 7021 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 45.

The square root of 129109995 is about 11362.6579196947. The cubic root of 129109995 is about 505.4210063029.

The spelling of 129109995 in words is "one hundred twenty-nine million, one hundred nine thousand, nine hundred ninety-five".