129728699 has 2 divisors, whose sum is σ = 129728700. Its totient is φ = 129728698.

The previous prime is 129728693. The next prime is 129728701. The reversal of 129728699 is 996827921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129728699 - 2²⁴ = 112951483 is a prime.

Together with 129728701, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129728699.

It is not a weakly prime, because it can be changed into another prime (129728693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64864349 + 64864350.

It is an arithmetic number, because the mean of its divisors is an integer number (64864350).

Almost surely, 2^129728699 is an apocalyptic number.

129728699 is a deficient number, since it is larger than the sum of its proper divisors (1).

129728699 is an equidigital number, since it uses as much as digits as its factorization.

129728699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The square root of 129728699 is about 11389.8507013920. The cubic root of 129728699 is about 506.2270575591.

The spelling of 129728699 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, six hundred ninety-nine".