999959903 has 2 divisors, whose sum is σ = 999959904. Its totient is φ = 999959902.

The previous prime is 999959897. The next prime is 999959923. The reversal of 999959903 is 309959999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999959903 - 2²⁰ = 998911327 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999959923) 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, 499979951 + 499979952.

It is an arithmetic number, because the mean of its divisors is an integer number (499979952).

Almost surely, 2^999959903 is an apocalyptic number.

999959903 is a deficient number, since it is larger than the sum of its proper divisors (1).

999959903 is an equidigital number, since it uses as much as digits as its factorization.

999959903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7971615, while the sum is 62.

The square root of 999959903 is about 31622.1426060917. The cubic root of 999959903 is about 999.9866341547.

The spelling of 999959903 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, nine hundred three".