129306981 has 12 divisors (see below), whose sum is σ = 183148832. Its totient is φ = 81133248.

The previous prime is 129306979. The next prime is 129306997. The reversal of 129306981 is 189603921.

It is not a de Polignac number, because 129306981 - 2¹ = 129306979 is a prime.

It is a super-2 number, since 2×129306981² = 33440590670668722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129306481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73705 + ... + 75438.

Almost surely, 2^129306981 is an apocalyptic number.

It is an amenable number.

129306981 is a deficient number, since it is larger than the sum of its proper divisors (53841851).

129306981 is a wasteful number, since it uses less digits than its factorization.

129306981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149180 (or 149163 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 129306981 is about 11371.3227462771. The cubic root of 129306981 is about 505.6779197230.

The spelling of 129306981 in words is "one hundred twenty-nine million, three hundred six thousand, nine hundred eighty-one".