129023281 has 8 divisors (see below), whose sum is σ = 136052000. Its totient is φ = 122018400.

The previous prime is 129023231. The next prime is 129023299. The reversal of 129023281 is 182320921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129023281 is a prime.

It is a super-2 number, since 2×129023281² = 33294014080009922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129023201) 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, 5770 + ... + 17068.

It is an arithmetic number, because the mean of its divisors is an integer number (17006500).

Almost surely, 2^129023281 is an apocalyptic number.

It is an amenable number.

129023281 is a deficient number, since it is larger than the sum of its proper divisors (7028719).

129023281 is a wasteful number, since it uses less digits than its factorization.

129023281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11919.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 129023281 is about 11358.8415342411. The cubic root of 129023281 is about 505.3078291818.

The spelling of 129023281 in words is "one hundred twenty-nine million, twenty-three thousand, two hundred eighty-one".