198289687 has 2 divisors, whose sum is σ = 198289688. Its totient is φ = 198289686.

The previous prime is 198289673. The next prime is 198289691. The reversal of 198289687 is 786982891.

It is a strong prime.

It is an emirp because it is prime and its reverse (786982891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198289687 - 2²³ = 189901079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198289627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99144843 + 99144844.

It is an arithmetic number, because the mean of its divisors is an integer number (99144844).

Almost surely, 2^198289687 is an apocalyptic number.

198289687 is a deficient number, since it is larger than the sum of its proper divisors (1).

198289687 is an equidigital number, since it uses as much as digits as its factorization.

198289687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 58.

The square root of 198289687 is about 14081.5370964962. The cubic root of 198289687 is about 583.1317779487.

The spelling of 198289687 in words is "one hundred ninety-eight million, two hundred eighty-nine thousand, six hundred eighty-seven".