206861593 has 8 divisors (see below), whose sum is σ = 219230280. Its totient is φ = 194515200.

The previous prime is 206861591. The next prime is 206861639. The reversal of 206861593 is 395168602.

It can be written as a sum of positive squares in 4 ways, for example, as 175085824 + 31775769 = 13232^2 + 5637^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 206861593 - 2¹ = 206861591 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206861591) by changing a digit.

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, 15943 + ... + 25843.

It is an arithmetic number, because the mean of its divisors is an integer number (27403785).

Almost surely, 2^206861593 is an apocalyptic number.

It is an amenable number.

206861593 is a deficient number, since it is larger than the sum of its proper divisors (12368687).

206861593 is a wasteful number, since it uses less digits than its factorization.

206861593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11147.

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

The square root of 206861593 is about 14382.6837898912. The cubic root of 206861593 is about 591.4162977280.

The spelling of 206861593 in words is "two hundred six million, eight hundred sixty-one thousand, five hundred ninety-three".