998123321879 has 2 divisors, whose sum is σ = 998123321880. Its totient is φ = 998123321878.

The previous prime is 998123321857. The next prime is 998123321927. The reversal of 998123321879 is 978123321899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998123321879 - 2²⁴ = 998106544663 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 (998183321879) 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, 499061660939 + 499061660940.

It is an arithmetic number, because the mean of its divisors is an integer number (499061660940).

Almost surely, 2^998123321879 is an apocalyptic number.

998123321879 is a deficient number, since it is larger than the sum of its proper divisors (1).

998123321879 is an equidigital number, since it uses as much as digits as its factorization.

998123321879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 62.

The spelling of 998123321879 in words is "nine hundred ninety-eight billion, one hundred twenty-three million, three hundred twenty-one thousand, eight hundred seventy-nine".