129845999 has 2 divisors, whose sum is σ = 129846000. Its totient is φ = 129845998.

The previous prime is 129845953. The next prime is 129846001. The reversal of 129845999 is 999548921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129845999 - 2¹⁶ = 129780463 is a prime.

Together with 129846001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129845399) 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, 64922999 + 64923000.

It is an arithmetic number, because the mean of its divisors is an integer number (64923000).

Almost surely, 2^129845999 is an apocalyptic number.

129845999 is a deficient number, since it is larger than the sum of its proper divisors (1).

129845999 is an equidigital number, since it uses as much as digits as its factorization.

129845999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 56.

The square root of 129845999 is about 11394.9988591487. The cubic root of 129845999 is about 506.3795875342.

The spelling of 129845999 in words is "one hundred twenty-nine million, eight hundred forty-five thousand, nine hundred ninety-nine".