129129761 has 8 divisors (see below), whose sum is σ = 131349504. Its totient is φ = 126928800.

The previous prime is 129129697. The next prime is 129129799. The reversal of 129129761 is 167921921.

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 129129761 - 2⁶ = 129129697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129129361) 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, 9536 + ... + 18686.

It is an arithmetic number, because the mean of its divisors is an integer number (16418688).

Almost surely, 2^129129761 is an apocalyptic number.

It is an amenable number.

129129761 is a deficient number, since it is larger than the sum of its proper divisors (2219743).

129129761 is a wasteful number, since it uses less digits than its factorization.

129129761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9391.

The product of its digits is 13608, while the sum is 38.

The square root of 129129761 is about 11363.5276652983. The cubic root of 129129761 is about 505.4467973396.

The spelling of 129129761 in words is "one hundred twenty-nine million, one hundred twenty-nine thousand, seven hundred sixty-one".