205000381 has 2 divisors, whose sum is σ = 205000382. Its totient is φ = 205000380.

The previous prime is 205000351. The next prime is 205000457. The reversal of 205000381 is 183000502.

It is a happy number.

205000381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201356100 + 3644281 = 14190^2 + 1909^2 .

It is a cyclic number.

It is not a de Polignac number, because 205000381 - 2²¹ = 202903229 is a prime.

It is a super-2 number, since 2×205000381² = 84050312420290322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205000351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102500190 + 102500191.

It is an arithmetic number, because the mean of its divisors is an integer number (102500191).

Almost surely, 2^205000381 is an apocalyptic number.

It is an amenable number.

205000381 is a deficient number, since it is larger than the sum of its proper divisors (1).

205000381 is an equidigital number, since it uses as much as digits as its factorization.

205000381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 205000381 is about 14317.8343683673. The cubic root of 205000381 is about 589.6372192840.

Adding to 205000381 its reverse (183000502), we get a palindrome (388000883).

The spelling of 205000381 in words is "two hundred five million, three hundred eighty-one", and thus it is an aban number.