999951863 has 2 divisors, whose sum is σ = 999951864. Its totient is φ = 999951862.

The previous prime is 999951857. The next prime is 999951877. The reversal of 999951863 is 368159999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999951863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999951163) 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, 499975931 + 499975932.

It is an arithmetic number, because the mean of its divisors is an integer number (499975932).

Almost surely, 2^999951863 is an apocalyptic number.

999951863 is a deficient number, since it is larger than the sum of its proper divisors (1).

999951863 is an equidigital number, since it uses as much as digits as its factorization.

999951863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920, while the sum is 59.

The square root of 999951863 is about 31622.0154797255. The cubic root of 999951863 is about 999.9839540759.

The spelling of 999951863 in words is "nine hundred ninety-nine million, nine hundred fifty-one thousand, eight hundred sixty-three".