999959867 has 2 divisors, whose sum is σ = 999959868. Its totient is φ = 999959866.

The previous prime is 999959803. The next prime is 999959869. The reversal of 999959867 is 768959999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999959867 - 2⁶ = 999959803 is a prime.

It is a super-2 number, since 2×999959867² = 1999839471221315378, which contains 22 as substring.

Together with 999959869, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999959867.

It is not a weakly prime, because it can be changed into another prime (999959869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499979933 + 499979934.

It is an arithmetic number, because the mean of its divisors is an integer number (499979934).

Almost surely, 2^999959867 is an apocalyptic number.

999959867 is a deficient number, since it is larger than the sum of its proper divisors (1).

999959867 is an equidigital number, since it uses as much as digits as its factorization.

999959867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99202320, while the sum is 71.

The square root of 999959867 is about 31622.1420368703. The cubic root of 999959867 is about 999.9866221544.

The spelling of 999959867 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, eight hundred sixty-seven".