198637 has 2 divisors, whose sum is σ = 198638. Its totient is φ = 198636.

The previous prime is 198623. The next prime is 198641. The reversal of 198637 is 736891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181476 + 17161 = 426^2 + 131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99318 + 99319.

It is an arithmetic number, because the mean of its divisors is an integer number (99319).

2¹⁹⁸⁶³⁷ is an apocalyptic number.

It is an amenable number.

198637 is a deficient number, since it is larger than the sum of its proper divisors (1).

198637 is an equidigital number, since it uses as much as digits as its factorization.

198637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 198637 is about 445.6871099774. The cubic root of 198637 is about 58.3472039578.

The spelling of 198637 in words is "one hundred ninety-eight thousand, six hundred thirty-seven".