129109619 has 8 divisors (see below), whose sum is σ = 131606160. Its totient is φ = 126637056.

The previous prime is 129109583. The next prime is 129109627. The reversal of 129109619 is 916901921.

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 129109619 - 2²⁴ = 112332403 is a prime.

It is a super-2 number, since 2×129109619² = 33338587436650322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129109319) 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, 5072 + ... + 16850.

It is an arithmetic number, because the mean of its divisors is an integer number (16450770).

Almost surely, 2^129109619 is an apocalyptic number.

129109619 is a deficient number, since it is larger than the sum of its proper divisors (2496541).

129109619 is a wasteful number, since it uses less digits than its factorization.

129109619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11989.

The product of its (nonzero) digits is 8748, while the sum is 38.

The square root of 129109619 is about 11362.6413742580. The cubic root of 129109619 is about 505.4205156658.

The spelling of 129109619 in words is "one hundred twenty-nine million, one hundred nine thousand, six hundred nineteen".