206609941 has 4 divisors (see below), whose sum is σ = 206651884. Its totient is φ = 206568000.

The previous prime is 206609939. The next prime is 206609957. The reversal of 206609941 is 149906602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 149906602 = 2 ⋅74953301.

It can be written as a sum of positive squares in 2 ways, for example, as 70980625 + 135629316 = 8425^2 + 11646^2 .

It is a cyclic number.

It is not a de Polignac number, because 206609941 - 2¹ = 206609939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206609941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206609911) 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, 12420 + ... + 23821.

It is an arithmetic number, because the mean of its divisors is an integer number (51662971).

Almost surely, 2^206609941 is an apocalyptic number.

It is an amenable number.

206609941 is a deficient number, since it is larger than the sum of its proper divisors (41943).

206609941 is an equidigital number, since it uses as much as digits as its factorization.

206609941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41942.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 206609941 is about 14373.9326908122. The cubic root of 206609941 is about 591.1763764599.

The spelling of 206609941 in words is "two hundred six million, six hundred nine thousand, nine hundred forty-one".