201281985 has 12 divisors (see below), whose sum is σ = 348888852. Its totient is φ = 107350368.

The previous prime is 201281963. The next prime is 201281987. The reversal of 201281985 is 589182102.

It can be written as a sum of positive squares in 2 ways, for example, as 36108081 + 165173904 = 6009^2 + 12852^2 .

It is not a de Polignac number, because 201281985 - 2⁹ = 201281473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201281987) 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 in 11 ways as a sum of consecutive naturals, for example, 2236422 + ... + 2236511.

It is an arithmetic number, because the mean of its divisors is an integer number (29074071).

Almost surely, 2^201281985 is an apocalyptic number.

It is an amenable number.

201281985 is a deficient number, since it is larger than the sum of its proper divisors (147606867).

201281985 is a wasteful number, since it uses less digits than its factorization.

201281985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472944 (or 4472941 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 201281985 is about 14187.3882374453. The cubic root of 201281985 is about 586.0504029689.

The spelling of 201281985 in words is "two hundred one million, two hundred eighty-one thousand, nine hundred eighty-five".