129861769 has 8 divisors (see below), whose sum is σ = 133176960. Its totient is φ = 126588000.

The previous prime is 129861761. The next prime is 129861791. The reversal of 129861769 is 967168921.

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 129861769 - 2³ = 129861761 is a prime.

It is a super-2 number, since 2×129861769² = 33728158095618722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129861761) 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, 3957 + ... + 16594.

It is an arithmetic number, because the mean of its divisors is an integer number (16647120).

Almost surely, 2^129861769 is an apocalyptic number.

It is an amenable number.

129861769 is a deficient number, since it is larger than the sum of its proper divisors (3315191).

129861769 is an equidigital number, since it uses as much as digits as its factorization.

129861769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20711.

The product of its digits is 326592, while the sum is 49.

The square root of 129861769 is about 11395.6908083714. The cubic root of 129861769 is about 506.4000869024.

The spelling of 129861769 in words is "one hundred twenty-nine million, eight hundred sixty-one thousand, seven hundred sixty-nine".