129292881 has 8 divisors (see below), whose sum is σ = 174327840. Its totient is φ = 85226592.

The previous prime is 129292879. The next prime is 129292907. The reversal of 129292881 is 188292921.

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

It is not a de Polignac number, because 129292881 - 2¹ = 129292879 is a prime.

It is a super-2 number, since 2×129292881² = 33433298154560322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129292841) 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, 241855 + ... + 242388.

It is an arithmetic number, because the mean of its divisors is an integer number (21790980).

Almost surely, 2^129292881 is an apocalyptic number.

It is an amenable number.

129292881 is a deficient number, since it is larger than the sum of its proper divisors (45034959).

129292881 is an equidigital number, since it uses as much as digits as its factorization.

129292881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484335.

The product of its digits is 41472, while the sum is 42.

The square root of 129292881 is about 11370.7027487311. The cubic root of 129292881 is about 505.6595388700.

The spelling of 129292881 in words is "one hundred twenty-nine million, two hundred ninety-two thousand, eight hundred eighty-one".