190565 has 4 divisors (see below), whose sum is σ = 228684. Its totient is φ = 152448.

The previous prime is 190543. The next prime is 190573. The reversal of 190565 is 565091.

190565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565091 = 281 ⋅2011.

It can be written as a sum of positive squares in 2 ways, for example, as 88804 + 101761 = 298^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 190565 - 2¹² = 186469 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19052 + ... + 19061.

It is an arithmetic number, because the mean of its divisors is an integer number (57171).

2¹⁹⁰⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

190565 is a deficient number, since it is larger than the sum of its proper divisors (38119).

190565 is an equidigital number, since it uses as much as digits as its factorization.

190565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38118.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 190565 is about 436.5375127065. The cubic root of 190565 is about 57.5458990793.

The spelling of 190565 in words is "one hundred ninety thousand, five hundred sixty-five".