205090453 has 4 divisors (see below), whose sum is σ = 205401388. Its totient is φ = 204779520.

The previous prime is 205090447. The next prime is 205090477. The reversal of 205090453 is 354090502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354090502 = 2 ⋅177045251.

It can be written as a sum of positive squares in 2 ways, for example, as 157176369 + 47914084 = 12537^2 + 6922^2 .

It is a cyclic number.

It is not a de Polignac number, because 205090453 - 2⁵ = 205090421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205090493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154476 + ... + 155797.

It is an arithmetic number, because the mean of its divisors is an integer number (51350347).

Almost surely, 2^205090453 is an apocalyptic number.

It is an amenable number.

205090453 is a deficient number, since it is larger than the sum of its proper divisors (310935).

205090453 is an equidigital number, since it uses as much as digits as its factorization.

205090453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310934.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 205090453 is about 14320.9794706926. The cubic root of 205090453 is about 589.7235638831.

The spelling of 205090453 in words is "two hundred five million, ninety thousand, four hundred fifty-three".