206145 has 20 divisors (see below), whose sum is σ = 370260. Its totient is φ = 109728.

The previous prime is 206123. The next prime is 206153. The reversal of 206145 is 541602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 123201 + 82944 = 351^2 + 288^2 .

It is not a de Polignac number, because 206145 - 2⁶ = 206081 is a prime.

It is a super-2 number, since 2×206145² = 84991522050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 151 + ... + 659.

It is an arithmetic number, because the mean of its divisors is an integer number (18513).

2²⁰⁶¹⁴⁵ is an apocalyptic number.

It is an amenable number.

206145 is a deficient number, since it is larger than the sum of its proper divisors (164115).

206145 is an equidigital number, since it uses as much as digits as its factorization.

206145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 206145 is about 454.0319372027. The cubic root of 206145 is about 59.0732595666.

Adding to 206145 its reverse (541602), we get a palindrome (747747).

It can be divided in two parts, 206 and 145, that added together give a triangular number (351 = T₂₆).

The spelling of 206145 in words is "two hundred six thousand, one hundred forty-five".