198521107 has 2 divisors, whose sum is σ = 198521108. Its totient is φ = 198521106.

The previous prime is 198521077. The next prime is 198521111. The reversal of 198521107 is 701125891.

It is a happy number.

198521107 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198521107 - 2¹¹ = 198519059 is a prime.

It is not a weakly prime, because it can be changed into another prime (198521137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99260553 + 99260554.

It is an arithmetic number, because the mean of its divisors is an integer number (99260554).

Almost surely, 2^198521107 is an apocalyptic number.

198521107 is a deficient number, since it is larger than the sum of its proper divisors (1).

198521107 is an equidigital number, since it uses as much as digits as its factorization.

198521107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 198521107 is about 14089.7518430950. The cubic root of 198521107 is about 583.3585436361.

Adding to 198521107 its reverse (701125891), we get a palindrome (899646998).

The spelling of 198521107 in words is "one hundred ninety-eight million, five hundred twenty-one thousand, one hundred seven".