129729651 has 4 divisors (see below), whose sum is σ = 172972872. Its totient is φ = 86486432.

The previous prime is 129729641. The next prime is 129729653. The reversal of 129729651 is 156927921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129729651 - 2²³ = 121341043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129729653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21621606 + ... + 21621611.

It is an arithmetic number, because the mean of its divisors is an integer number (43243218).

Almost surely, 2^129729651 is an apocalyptic number.

129729651 is a deficient number, since it is larger than the sum of its proper divisors (43243221).

129729651 is an equidigital number, since it uses as much as digits as its factorization.

129729651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43243220.

The product of its digits is 68040, while the sum is 42.

The square root of 129729651 is about 11389.8924929079. The cubic root of 129729651 is about 506.2282958535.

The spelling of 129729651 in words is "one hundred twenty-nine million, seven hundred twenty-nine thousand, six hundred fifty-one".