198824981 has 2 divisors, whose sum is σ = 198824982. Its totient is φ = 198824980.

The previous prime is 198824971. The next prime is 198825001. The reversal of 198824981 is 189428891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129185956 + 69639025 = 11366^2 + 8345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198824981 is a prime.

It is a super-2 number, since 2×198824981² = 79062746139300722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198824971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99412490 + 99412491.

It is an arithmetic number, because the mean of its divisors is an integer number (99412491).

Almost surely, 2^198824981 is an apocalyptic number.

It is an amenable number.

198824981 is a deficient number, since it is larger than the sum of its proper divisors (1).

198824981 is an equidigital number, since it uses as much as digits as its factorization.

198824981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 50.

The square root of 198824981 is about 14100.5312311274. The cubic root of 198824981 is about 583.6560386590.

The spelling of 198824981 in words is "one hundred ninety-eight million, eight hundred twenty-four thousand, nine hundred eighty-one".