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198997 is a prime number
BaseRepresentation
bin110000100101010101
3101002222021
4300211111
522331442
64133141
71456111
oct604525
9332867
10198997
11126567
12971b1
136c766
1452741
153de67
hex30955

198997 has 2 divisors, whose sum is σ = 198998. Its totient is φ = 198996.

The previous prime is 198977. The next prime is 199021. The reversal of 198997 is 799891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198916 + 81 = 446^2 + 9^2 .

It is an emirp because it is prime and its reverse (799891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-198997 is a prime.

198997 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99498 + 99499.

It is an arithmetic number, because the mean of its divisors is an integer number (99499).

2198997 is an apocalyptic number.

It is an amenable number.

198997 is a deficient number, since it is larger than the sum of its proper divisors (1).

198997 is an equidigital number, since it uses as much as digits as its factorization.

198997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 198997 is about 446.0907979324. The cubic root of 198997 is about 58.3824312261.

The spelling of 198997 in words is "one hundred ninety-eight thousand, nine hundred ninety-seven".