205681253 has 4 divisors (see below), whose sum is σ = 212773740. Its totient is φ = 198588768.

The previous prime is 205681211. The next prime is 205681271. The reversal of 205681253 is 352186502.

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 145974724 + 59706529 = 12082^2 + 7727^2 .

It is a cyclic number.

It is not a de Polignac number, because 205681253 - 2¹⁶ = 205615717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205681153) 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, 3546200 + ... + 3546257.

It is an arithmetic number, because the mean of its divisors is an integer number (53193435).

Almost surely, 2^205681253 is an apocalyptic number.

It is an amenable number.

205681253 is a deficient number, since it is larger than the sum of its proper divisors (7092487).

205681253 is an equidigital number, since it uses as much as digits as its factorization.

205681253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7092486.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 205681253 is about 14341.5917177976. The cubic root of 205681253 is about 590.2892893301.

The spelling of 205681253 in words is "two hundred five million, six hundred eighty-one thousand, two hundred fifty-three".