205519 has 2 divisors, whose sum is σ = 205520. Its totient is φ = 205518.

The previous prime is 205507. The next prime is 205529. The reversal of 205519 is 915502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205519 - 2⁵ = 205487 is a prime.

It is a super-2 number, since 2×205519² = 84476118722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102759 + 102760.

It is an arithmetic number, because the mean of its divisors is an integer number (102760).

2²⁰⁵⁵¹⁹ is an apocalyptic number.

205519 is a deficient number, since it is larger than the sum of its proper divisors (1).

205519 is an equidigital number, since it uses as much as digits as its factorization.

205519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 205519 is about 453.3420342302. The cubic root of 205519 is about 59.0134030643.

The spelling of 205519 in words is "two hundred five thousand, five hundred nineteen".