129158709 has 8 divisors (see below), whose sum is σ = 172313952. Its totient is φ = 86054640.

The previous prime is 129158693. The next prime is 129158723. The reversal of 129158709 is 907851921.

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

It is not a de Polignac number, because 129158709 - 2⁴ = 129158693 is a prime.

It is a super-2 number, since 2×129158709² = 33363944221093362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129158609) 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, 6454 + ... + 17319.

It is an arithmetic number, because the mean of its divisors is an integer number (21539244).

Almost surely, 2^129158709 is an apocalyptic number.

It is an amenable number.

129158709 is a deficient number, since it is larger than the sum of its proper divisors (43155243).

129158709 is a wasteful number, since it uses less digits than its factorization.

129158709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25587.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 129158709 is about 11364.8013181049. The cubic root of 129158709 is about 505.4845644677.

The spelling of 129158709 in words is "one hundred twenty-nine million, one hundred fifty-eight thousand, seven hundred nine".