129981916 has 6 divisors (see below), whose sum is σ = 227468360. Its totient is φ = 64990956.

The previous prime is 129981913. The next prime is 129981923. The reversal of 129981916 is 619189921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129981913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16247736 + ... + 16247743.

Almost surely, 2^129981916 is an apocalyptic number.

It is an amenable number.

129981916 is a deficient number, since it is larger than the sum of its proper divisors (97486444).

129981916 is a wasteful number, since it uses less digits than its factorization.

129981916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32495483 (or 32495481 counting only the distinct ones).

The product of its digits is 69984, while the sum is 46.

The square root of 129981916 is about 11400.9611875491. The cubic root of 129981916 is about 506.5562111097.

The spelling of 129981916 in words is "one hundred twenty-nine million, nine hundred eighty-one thousand, nine hundred sixteen".