205256197 has 4 divisors (see below), whose sum is σ = 205291116. Its totient is φ = 205221280.

The previous prime is 205256189. The next prime is 205256203. The reversal of 205256197 is 791652502.

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 146748996 + 58507201 = 12114^2 + 7649^2 .

It is a cyclic number.

It is not a de Polignac number, because 205256197 - 2³ = 205256189 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 (205256137) 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, 6238 + ... + 21199.

It is an arithmetic number, because the mean of its divisors is an integer number (51322779).

Almost surely, 2^205256197 is an apocalyptic number.

It is an amenable number.

205256197 is a deficient number, since it is larger than the sum of its proper divisors (34919).

205256197 is an equidigital number, since it uses as much as digits as its factorization.

205256197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34918.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 205256197 is about 14326.7650570532. The cubic root of 205256197 is about 589.8823829511.

The spelling of 205256197 in words is "two hundred five million, two hundred fifty-six thousand, one hundred ninety-seven".