205613213 has 4 divisors (see below), whose sum is σ = 221429628. Its totient is φ = 189796800.

The previous prime is 205613209. The next prime is 205613251. The reversal of 205613213 is 312316502.

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 28536964 + 177076249 = 5342^2 + 13307^2 .

It is a cyclic number.

It is not a de Polignac number, because 205613213 - 2² = 205613209 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 (205613263) 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, 7908188 + ... + 7908213.

It is an arithmetic number, because the mean of its divisors is an integer number (55357407).

Almost surely, 2^205613213 is an apocalyptic number.

It is an amenable number.

205613213 is a deficient number, since it is larger than the sum of its proper divisors (15816415).

205613213 is a wasteful number, since it uses less digits than its factorization.

205613213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15816414.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 205613213 is about 14339.2193999534. The cubic root of 205613213 is about 590.2241923055.

Adding to 205613213 its reverse (312316502), we get a palindrome (517929715).

The spelling of 205613213 in words is "two hundred five million, six hundred thirteen thousand, two hundred thirteen".