198281687 has 2 divisors, whose sum is σ = 198281688. Its totient is φ = 198281686.

The previous prime is 198281683. The next prime is 198281719. The reversal of 198281687 is 786182891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198281687 - 2² = 198281683 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198281683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99140843 + 99140844.

It is an arithmetic number, because the mean of its divisors is an integer number (99140844).

Almost surely, 2^198281687 is an apocalyptic number.

198281687 is a deficient number, since it is larger than the sum of its proper divisors (1).

198281687 is an equidigital number, since it uses as much as digits as its factorization.

198281687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 50.

The square root of 198281687 is about 14081.2530337325. The cubic root of 198281687 is about 583.1239356901.

The spelling of 198281687 in words is "one hundred ninety-eight million, two hundred eighty-one thousand, six hundred eighty-seven".