198682889 has 2 divisors, whose sum is σ = 198682890. Its totient is φ = 198682888.

The previous prime is 198682823. The next prime is 198682903. The reversal of 198682889 is 988286891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197262025 + 1420864 = 14045^2 + 1192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198682889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198682189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99341444 + 99341445.

It is an arithmetic number, because the mean of its divisors is an integer number (99341445).

Almost surely, 2^198682889 is an apocalyptic number.

It is an amenable number.

198682889 is a deficient number, since it is larger than the sum of its proper divisors (1).

198682889 is an equidigital number, since it uses as much as digits as its factorization.

198682889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 59.

The square root of 198682889 is about 14095.4917970250. The cubic root of 198682889 is about 583.5169672380.

The spelling of 198682889 in words is "one hundred ninety-eight million, six hundred eighty-two thousand, eight hundred eighty-nine".