198964581 has 16 divisors (see below), whose sum is σ = 269241600. Its totient is φ = 130673088.

The previous prime is 198964531. The next prime is 198964609. The reversal of 198964581 is 185469891.

It is not a de Polignac number, because 198964581 - 2⁷ = 198964453 is a prime.

It is a super-2 number, since 2×198964581² = 79173808985011122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198964511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178855 + ... + 179963.

It is an arithmetic number, because the mean of its divisors is an integer number (16827600).

Almost surely, 2^198964581 is an apocalyptic number.

It is an amenable number.

198964581 is a deficient number, since it is larger than the sum of its proper divisors (70277019).

198964581 is a wasteful number, since it uses less digits than its factorization.

198964581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948.

The product of its digits is 622080, while the sum is 51.

The square root of 198964581 is about 14105.4805306306. The cubic root of 198964581 is about 583.7926065434.

The spelling of 198964581 in words is "one hundred ninety-eight million, nine hundred sixty-four thousand, five hundred eighty-one".