205523213 has 16 divisors (see below), whose sum is σ = 241103616. Its totient is φ = 171555840.

The previous prime is 205523179. The next prime is 205523243. The reversal of 205523213 is 312325502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205523213 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 (205523243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41645 + ... + 46317.

It is an arithmetic number, because the mean of its divisors is an integer number (15068976).

Almost surely, 2^205523213 is an apocalyptic number.

It is an amenable number.

205523213 is a deficient number, since it is larger than the sum of its proper divisors (35580403).

205523213 is a wasteful number, since it uses less digits than its factorization.

205523213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4844.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 205523213 is about 14336.0808103191. The cubic root of 205523213 is about 590.1380630649.

Adding to 205523213 its reverse (312325502), we get a palindrome (517848715).

The spelling of 205523213 in words is "two hundred five million, five hundred twenty-three thousand, two hundred thirteen".