999998879987 has 2 divisors, whose sum is σ = 999998879988. Its totient is φ = 999998879986.

The previous prime is 999998879977. The next prime is 999998880011. The reversal of 999998879987 is 789978899999.

It is a weak prime.

It is an emirp because it is prime and its reverse (789978899999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999998879987 - 2⁶ = 999998879923 is a prime.

It is not a weakly prime, because it can be changed into another prime (999998879977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999439993 + 499999439994.

It is an arithmetic number, because the mean of its divisors is an integer number (499999439994).

Almost surely, 2^999998879987 is an apocalyptic number.

999998879987 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998879987 is an equidigital number, since it uses as much as digits as its factorization.

999998879987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119995126272, while the sum is 101.

The spelling of 999998879987 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, eight hundred seventy-nine thousand, nine hundred eighty-seven".