129085881 has 8 divisors (see below), whose sum is σ = 174538944. Its totient is φ = 84845040.

The previous prime is 129085849. The next prime is 129085907. The reversal of 129085881 is 188580921.

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

It is not a de Polignac number, because 129085881 - 2⁵ = 129085849 is a prime.

It is a super-2 number, since 2×129085881² = 33326329347092322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129085841) 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, 302806 + ... + 303231.

It is an arithmetic number, because the mean of its divisors is an integer number (21817368).

Almost surely, 2^129085881 is an apocalyptic number.

It is an amenable number.

129085881 is a deficient number, since it is larger than the sum of its proper divisors (45453063).

129085881 is an equidigital number, since it uses as much as digits as its factorization.

129085881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606111.

The product of its (nonzero) digits is 46080, while the sum is 42.

The square root of 129085881 is about 11361.5967627794. The cubic root of 129085881 is about 505.3895383519.

The spelling of 129085881 in words is "one hundred twenty-nine million, eighty-five thousand, eight hundred eighty-one".