198931211649 has 12 divisors (see below), whose sum is σ = 302468509200. Its totient is φ = 125640765144.

The previous prime is 198931211593. The next prime is 198931211651. The reversal of 198931211649 is 946112139891.

It is a happy number.

It is not a de Polignac number, because 198931211649 - 2⁸ = 198931211393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198931211595 and 198931211604.

It is not an unprimeable number, because it can be changed into a prime (198931211749) 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 in 11 ways as a sum of consecutive naturals, for example, 581670039 + ... + 581670380.

It is an arithmetic number, because the mean of its divisors is an integer number (25205709100).

Almost surely, 2^198931211649 is an apocalyptic number.

198931211649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

198931211649 is a deficient number, since it is larger than the sum of its proper divisors (103537297551).

198931211649 is a wasteful number, since it uses less digits than its factorization.

198931211649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163340444 (or 1163340441 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The spelling of 198931211649 in words is "one hundred ninety-eight billion, nine hundred thirty-one million, two hundred eleven thousand, six hundred forty-nine".