1998731113 has 2 divisors, whose sum is σ = 1998731114. Its totient is φ = 1998731112.

The previous prime is 1998731101. The next prime is 1998731129. The reversal of 1998731113 is 3111378991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1995587584 + 3143529 = 44672^2 + 1773^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998731113 - 2¹⁷ = 1998600041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1998731113.

It is not a weakly prime, because it can be changed into another prime (1998731143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999365556 + 999365557.

It is an arithmetic number, because the mean of its divisors is an integer number (999365557).

Almost surely, 2^1998731113 is an apocalyptic number.

It is an amenable number.

1998731113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998731113 is an equidigital number, since it uses as much as digits as its factorization.

1998731113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 43.

The square root of 1998731113 is about 44707.1707111958. The cubic root of 1998731113 is about 1259.6545439524.

The spelling of 1998731113 in words is "one billion, nine hundred ninety-eight million, seven hundred thirty-one thousand, one hundred thirteen".