129290881 has 8 divisors (see below), whose sum is σ = 130750400. Its totient is φ = 127839600.

The previous prime is 129290869. The next prime is 129290891. The reversal of 129290881 is 188092921.

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 129290881 - 2⁵ = 129290849 is a prime.

It is a super-2 number, since 2×129290881² = 33432263819512322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129290891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32710 + ... + 36448.

It is an arithmetic number, because the mean of its divisors is an integer number (16343800).

Almost surely, 2^129290881 is an apocalyptic number.

It is an amenable number.

129290881 is a deficient number, since it is larger than the sum of its proper divisors (1459519).

129290881 is a wasteful number, since it uses less digits than its factorization.

129290881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 129290881 is about 11370.6148030790. The cubic root of 129290881 is about 505.6569315486.

The spelling of 129290881 in words is "one hundred twenty-nine million, two hundred ninety thousand, eight hundred eighty-one".