129081 has 8 divisors (see below), whose sum is σ = 182304. Its totient is φ = 80960.

The previous prime is 129061. The next prime is 129083. The reversal of 129081 is 180921.

129081 = 79² + 80² + ... + 95².

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 129081 - 2⁵ = 129049 is a prime.

It is a super-2 number, since 2×129081² = 33323809122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129083) 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, 1215 + ... + 1316.

It is an arithmetic number, because the mean of its divisors is an integer number (22788).

2¹²⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

129081 is a deficient number, since it is larger than the sum of its proper divisors (53223).

129081 is a wasteful number, since it uses less digits than its factorization.

129081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 129081 is about 359.2784435504. The cubic root of 129081 is about 50.5383168336.

The spelling of 129081 in words is "one hundred twenty-nine thousand, eighty-one".