129190881 has 8 divisors (see below), whose sum is σ = 172559520. Its totient is φ = 85974752.

The previous prime is 129190843. The next prime is 129190883. The reversal of 129190881 is 188091921.

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 129190881 - 2¹⁰ = 129189857 is a prime.

It is a super-2 number, since 2×129190881² = 33380567467112322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129190883) 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, 36135 + ... + 39548.

It is an arithmetic number, because the mean of its divisors is an integer number (21569940).

Almost surely, 2^129190881 is an apocalyptic number.

It is an amenable number.

129190881 is a deficient number, since it is larger than the sum of its proper divisors (43368639).

129190881 is an equidigital number, since it uses as much as digits as its factorization.

129190881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76255.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 129190881 is about 11366.2166528709. The cubic root of 129190881 is about 505.5265311804.

The spelling of 129190881 in words is "one hundred twenty-nine million, one hundred ninety thousand, eight hundred eighty-one".