999653999 has 2 divisors, whose sum is σ = 999654000. Its totient is φ = 999653998.

The previous prime is 999653989. The next prime is 999654017. The reversal of 999653999 is 999356999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999653999 - 2¹⁶ = 999588463 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 (999653939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499826999 + 499827000.

It is an arithmetic number, because the mean of its divisors is an integer number (499827000).

Almost surely, 2^999653999 is an apocalyptic number.

999653999 is a deficient number, since it is larger than the sum of its proper divisors (1).

999653999 is an equidigital number, since it uses as much as digits as its factorization.

999653999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47829690, while the sum is 68.

The square root of 999653999 is about 31617.3053722167. The cubic root of 999653999 is about 999.8846530289.

The spelling of 999653999 in words is "nine hundred ninety-nine million, six hundred fifty-three thousand, nine hundred ninety-nine".