198961601 has 2 divisors, whose sum is σ = 198961602. Its totient is φ = 198961600.

The previous prime is 198961589. The next prime is 198961603. The reversal of 198961601 is 106169891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175536001 + 23425600 = 13249^2 + 4840^2 .

It is a cyclic number.

It is not a de Polignac number, because 198961601 - 2⁶ = 198961537 is a prime.

Together with 198961603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198961603) 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 as a sum of consecutive naturals, namely, 99480800 + 99480801.

It is an arithmetic number, because the mean of its divisors is an integer number (99480801).

Almost surely, 2^198961601 is an apocalyptic number.

It is an amenable number.

198961601 is a deficient number, since it is larger than the sum of its proper divisors (1).

198961601 is an equidigital number, since it uses as much as digits as its factorization.

198961601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 198961601 is about 14105.3748975346. The cubic root of 198961601 is about 583.7896919365.

The spelling of 198961601 in words is "one hundred ninety-eight million, nine hundred sixty-one thousand, six hundred one".