1998812836931 has 2 divisors, whose sum is σ = 1998812836932. Its totient is φ = 1998812836930.

The previous prime is 1998812836901. The next prime is 1998812836957. The reversal of 1998812836931 is 1396382188991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998812836931 - 2³⁴ = 1981632967747 is a prime.

It is a super-2 number, since 2×1998812836931² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1998812836901) 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, 999406418465 + 999406418466.

It is an arithmetic number, because the mean of its divisors is an integer number (999406418466).

Almost surely, 2^{1998812836931} is an apocalyptic number.

1998812836931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998812836931 is an equidigital number, since it uses as much as digits as its factorization.

1998812836931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40310784, while the sum is 68.

The spelling of 1998812836931 in words is "one trillion, nine hundred ninety-eight billion, eight hundred twelve million, eight hundred thirty-six thousand, nine hundred thirty-one".