1998198181829 has 2 divisors, whose sum is σ = 1998198181830. Its totient is φ = 1998198181828.

The previous prime is 1998198181717. The next prime is 1998198181843. The reversal of 1998198181829 is 9281818918991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1618467396100 + 379730785729 = 1272190^2 + 616223^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998198181829 - 2¹⁶ = 1998198116293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998198189829) 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, 999099090914 + 999099090915.

It is an arithmetic number, because the mean of its divisors is an integer number (999099090915).

Almost surely, 2^{1998198181829} is an apocalyptic number.

It is an amenable number.

1998198181829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998198181829 is an equidigital number, since it uses as much as digits as its factorization.

1998198181829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53747712, while the sum is 74.

The spelling of 1998198181829 in words is "one trillion, nine hundred ninety-eight billion, one hundred ninety-eight million, one hundred eighty-one thousand, eight hundred twenty-nine".