198265087 has 2 divisors, whose sum is σ = 198265088. Its totient is φ = 198265086.

The previous prime is 198265061. The next prime is 198265091. The reversal of 198265087 is 780562891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198265087 - 2¹⁵ = 198232319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198265387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99132543 + 99132544.

It is an arithmetic number, because the mean of its divisors is an integer number (99132544).

Almost surely, 2^198265087 is an apocalyptic number.

198265087 is a deficient number, since it is larger than the sum of its proper divisors (1).

198265087 is an equidigital number, since it uses as much as digits as its factorization.

198265087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 198265087 is about 14080.6635852150. The cubic root of 198265087 is about 583.1076623307.

The spelling of 198265087 in words is "one hundred ninety-eight million, two hundred sixty-five thousand, eighty-seven".