204205381 has 2 divisors, whose sum is σ = 204205382. Its totient is φ = 204205380.

The previous prime is 204205373. The next prime is 204205433. The reversal of 204205381 is 183502402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156125025 + 48080356 = 12495^2 + 6934^2 .

It is a cyclic number.

It is not a de Polignac number, because 204205381 - 2³ = 204205373 is a prime.

It is a super-2 number, since 2×204205381² = 83399675258710322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204205361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102102690 + 102102691.

It is an arithmetic number, because the mean of its divisors is an integer number (102102691).

Almost surely, 2^204205381 is an apocalyptic number.

It is an amenable number.

204205381 is a deficient number, since it is larger than the sum of its proper divisors (1).

204205381 is an equidigital number, since it uses as much as digits as its factorization.

204205381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 204205381 is about 14290.0448214832. The cubic root of 204205381 is about 588.8740193086.

Adding to 204205381 its reverse (183502402), we get a palindrome (387707783).

The spelling of 204205381 in words is "two hundred four million, two hundred five thousand, three hundred eighty-one".