206851985 has 8 divisors (see below), whose sum is σ = 248800896. Its totient is φ = 165095920.

The previous prime is 206851969. The next prime is 206851991. The reversal of 206851985 is 589158602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206851985 - 2⁴ = 206851969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 45839 + ... + 50148.

It is an arithmetic number, because the mean of its divisors is an integer number (31100112).

Almost surely, 2^206851985 is an apocalyptic number.

It is an amenable number.

206851985 is a deficient number, since it is larger than the sum of its proper divisors (41948911).

206851985 is an equidigital number, since it uses as much as digits as its factorization.

206851985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96423.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 206851985 is about 14382.3497732464. The cubic root of 206851985 is about 591.4071411777.

The spelling of 206851985 in words is "two hundred six million, eight hundred fifty-one thousand, nine hundred eighty-five".