205540253 has 4 divisors (see below), whose sum is σ = 205631580. Its totient is φ = 205448928.

The previous prime is 205540207. The next prime is 205540267. The reversal of 205540253 is 352045502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121396324 + 84143929 = 11018^2 + 9173^2 .

It is a cyclic number.

It is not a de Polignac number, because 205540253 - 2⁶ = 205540189 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 (205545253) 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, 42200 + ... + 46817.

It is an arithmetic number, because the mean of its divisors is an integer number (51407895).

Almost surely, 2^205540253 is an apocalyptic number.

It is an amenable number.

205540253 is a deficient number, since it is larger than the sum of its proper divisors (91327).

205540253 is an equidigital number, since it uses as much as digits as its factorization.

205540253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91326.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 205540253 is about 14336.6751026868. The cubic root of 205540253 is about 590.1543721305.

Adding to 205540253 its reverse (352045502), we get a palindrome (557585755).

The spelling of 205540253 in words is "two hundred five million, five hundred forty thousand, two hundred fifty-three".