198817 has 2 divisors, whose sum is σ = 198818. Its totient is φ = 198816.

The previous prime is 198811. The next prime is 198823. The reversal of 198817 is 718891.

It is a balanced prime because it is at equal distance from previous prime (198811) and next prime (198823).

It can be written as a sum of positive squares in only one way, i.e., 197136 + 1681 = 444^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 198817 - 2⁷ = 198689 is a prime.

It is a super-4 number, since 4×198817⁴ (a number of 22 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (198811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99408 + 99409.

It is an arithmetic number, because the mean of its divisors is an integer number (99409).

2¹⁹⁸⁸¹⁷ is an apocalyptic number.

It is an amenable number.

198817 is a deficient number, since it is larger than the sum of its proper divisors (1).

198817 is an equidigital number, since it uses as much as digits as its factorization.

198817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 34.

The square root of 198817 is about 445.8889996400. Note that the first 3 decimals coincide. The cubic root of 198817 is about 58.3648229075.

It can be divided in two parts, 19 and 8817, that added together give a square (8836 = 94²).

The spelling of 198817 in words is "one hundred ninety-eight thousand, eight hundred seventeen".