198126881 has 2 divisors, whose sum is σ = 198126882. Its totient is φ = 198126880.

The previous prime is 198126833. The next prime is 198126911. The reversal of 198126881 is 188621891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191573281 + 6553600 = 13841^2 + 2560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198126881 is a prime.

It is a super-3 number, since 3×198126881³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198126781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99063440 + 99063441.

It is an arithmetic number, because the mean of its divisors is an integer number (99063441).

Almost surely, 2^198126881 is an apocalyptic number.

It is an amenable number.

198126881 is a deficient number, since it is larger than the sum of its proper divisors (1).

198126881 is an equidigital number, since it uses as much as digits as its factorization.

198126881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 44.

The square root of 198126881 is about 14075.7550774372. The cubic root of 198126881 is about 582.9721405543.

The spelling of 198126881 in words is "one hundred ninety-eight million, one hundred twenty-six thousand, eight hundred eighty-one".