999603659 has 2 divisors, whose sum is σ = 999603660. Its totient is φ = 999603658.

The previous prime is 999603641. The next prime is 999603707. The reversal of 999603659 is 956306999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999603659 - 2²⁰ = 998555083 is a prime.

It is not a weakly prime, because it can be changed into another prime (999603629) 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, 499801829 + 499801830.

It is an arithmetic number, because the mean of its divisors is an integer number (499801830).

Almost surely, 2^999603659 is an apocalyptic number.

999603659 is a deficient number, since it is larger than the sum of its proper divisors (1).

999603659 is an equidigital number, since it uses as much as digits as its factorization.

999603659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3542940, while the sum is 56.

The square root of 999603659 is about 31616.5092791725. The cubic root of 999603659 is about 999.8678688755.

The spelling of 999603659 in words is "nine hundred ninety-nine million, six hundred three thousand, six hundred fifty-nine".