129980861 has 8 divisors (see below), whose sum is σ = 142066944. Its totient is φ = 118388160.

The previous prime is 129980821. The next prime is 129980869. The reversal of 129980861 is 168089921.

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-129980861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129980869) 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, 122795 + ... + 123848.

It is an arithmetic number, because the mean of its divisors is an integer number (17758368).

Almost surely, 2^129980861 is an apocalyptic number.

It is an amenable number.

129980861 is a deficient number, since it is larger than the sum of its proper divisors (12086083).

129980861 is a wasteful number, since it uses less digits than its factorization.

129980861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246691.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 129980861 is about 11400.9149194264. The cubic root of 129980861 is about 506.5548406159.

The spelling of 129980861 in words is "one hundred twenty-nine million, nine hundred eighty thousand, eight hundred sixty-one".