198968587 has 2 divisors, whose sum is σ = 198968588. Its totient is φ = 198968586.

The previous prime is 198968579. The next prime is 198968599. The reversal of 198968587 is 785869891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198968587 - 2³ = 198968579 is a prime.

It is a super-2 number, since 2×198968587² = 79176997225553138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198962587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99484293 + 99484294.

It is an arithmetic number, because the mean of its divisors is an integer number (99484294).

Almost surely, 2^198968587 is an apocalyptic number.

198968587 is a deficient number, since it is larger than the sum of its proper divisors (1).

198968587 is an equidigital number, since it uses as much as digits as its factorization.

198968587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 61.

The square root of 198968587 is about 14105.6225314589. The cubic root of 198968587 is about 583.7965245900.

The spelling of 198968587 in words is "one hundred ninety-eight million, nine hundred sixty-eight thousand, five hundred eighty-seven".