129684287 has 2 divisors, whose sum is σ = 129684288. Its totient is φ = 129684286.

The previous prime is 129684283. The next prime is 129684311. The reversal of 129684287 is 782486921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129684287 - 2² = 129684283 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129684283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64842143 + 64842144.

It is an arithmetic number, because the mean of its divisors is an integer number (64842144).

Almost surely, 2^129684287 is an apocalyptic number.

129684287 is a deficient number, since it is larger than the sum of its proper divisors (1).

129684287 is an equidigital number, since it uses as much as digits as its factorization.

129684287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 129684287 is about 11387.9009040297. The cubic root of 129684287 is about 506.1692828278.

The spelling of 129684287 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, two hundred eighty-seven".