206985361 has 4 divisors (see below), whose sum is σ = 225802224. Its totient is φ = 188168500.

The previous prime is 206985329. The next prime is 206985379. The reversal of 206985361 is 163589602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206985361 - 2⁵ = 206985329 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206985301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9408415 + ... + 9408436.

It is an arithmetic number, because the mean of its divisors is an integer number (56450556).

Almost surely, 2^206985361 is an apocalyptic number.

It is an amenable number.

206985361 is a deficient number, since it is larger than the sum of its proper divisors (18816863).

206985361 is a wasteful number, since it uses less digits than its factorization.

206985361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18816862.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 206985361 is about 14386.9858205254. The cubic root of 206985361 is about 591.5342249172.

The spelling of 206985361 in words is "two hundred six million, nine hundred eighty-five thousand, three hundred sixty-one".