129929649 has 16 divisors (see below), whose sum is σ = 179172864. Its totient is φ = 83664000.

The previous prime is 129929647. The next prime is 129929651. The reversal of 129929649 is 946929921.

It is an interprime number because it is at equal distance from previous prime (129929647) and next prime (129929651).

It is not a de Polignac number, because 129929649 - 2¹ = 129929647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129929647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64197 + ... + 66189.

It is an arithmetic number, because the mean of its divisors is an integer number (11198304).

Almost surely, 2^129929649 is an apocalyptic number.

It is an amenable number.

129929649 is a deficient number, since it is larger than the sum of its proper divisors (49243215).

129929649 is a wasteful number, since it uses less digits than its factorization.

129929649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728.

The product of its digits is 629856, while the sum is 51.

The square root of 129929649 is about 11398.6687380588. The cubic root of 129929649 is about 506.4883049377.

The spelling of 129929649 in words is "one hundred twenty-nine million, nine hundred twenty-nine thousand, six hundred forty-nine".