206369 has 2 divisors, whose sum is σ = 206370. Its totient is φ = 206368.

The previous prime is 206351. The next prime is 206383. The reversal of 206369 is 963602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193600 + 12769 = 440^2 + 113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206369 is a prime.

It is a super-2 number, since 2×206369² = 85176328322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (206399) by changing a digit.

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 as a sum of consecutive naturals, namely, 103184 + 103185.

It is an arithmetic number, because the mean of its divisors is an integer number (103185).

2²⁰⁶³⁶⁹ is an apocalyptic number.

It is an amenable number.

206369 is a deficient number, since it is larger than the sum of its proper divisors (1).

206369 is an equidigital number, since it uses as much as digits as its factorization.

206369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 206369 is about 454.2785489102. The cubic root of 206369 is about 59.0946484275.

It can be divided in two parts, 206 and 369, that added together give a palindrome (575).

The spelling of 206369 in words is "two hundred six thousand, three hundred sixty-nine".