999959803 has 2 divisors, whose sum is σ = 999959804. Its totient is φ = 999959802.

The previous prime is 999959747. The next prime is 999959867. The reversal of 999959803 is 308959999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999959803 is a prime.

It is not a weakly prime, because it can be changed into another prime (999959603) 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, 499979901 + 499979902.

It is an arithmetic number, because the mean of its divisors is an integer number (499979902).

Almost surely, 2^999959803 is an apocalyptic number.

999959803 is a deficient number, since it is larger than the sum of its proper divisors (1).

999959803 is an equidigital number, since it uses as much as digits as its factorization.

999959803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7085880, while the sum is 61.

The square root of 999959803 is about 31622.1410249211. The cubic root of 999959803 is about 999.9866008205.

The spelling of 999959803 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, eight hundred three".