198501985 has 16 divisors (see below), whose sum is σ = 260540352. Its totient is φ = 143985600.

The previous prime is 198501973. The next prime is 198501997. The reversal of 198501985 is 589105891.

It is an interprime number because it is at equal distance from previous prime (198501973) and next prime (198501997).

It is not a de Polignac number, because 198501985 - 2⁹ = 198501473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17290 + ... + 26380.

It is an arithmetic number, because the mean of its divisors is an integer number (16283772).

Almost surely, 2^198501985 is an apocalyptic number.

It is an amenable number.

198501985 is a deficient number, since it is larger than the sum of its proper divisors (62038367).

198501985 is a wasteful number, since it uses less digits than its factorization.

198501985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9504.

The product of its (nonzero) digits is 129600, while the sum is 46.

The square root of 198501985 is about 14089.0732484433. The cubic root of 198501985 is about 583.3398128985.

The spelling of 198501985 in words is "one hundred ninety-eight million, five hundred one thousand, nine hundred eighty-five".