205243481 has 2 divisors, whose sum is σ = 205243482. Its totient is φ = 205243480.

The previous prime is 205243393. The next prime is 205243483. The reversal of 205243481 is 184342502.

It is a happy number.

205243481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146797456 + 58446025 = 12116^2 + 7645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205243481 is a prime.

It is a super-2 number, since 2×205243481² = 84249772985994722, which contains 22 as substring.

Together with 205243483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205243483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102621740 + 102621741.

It is an arithmetic number, because the mean of its divisors is an integer number (102621741).

Almost surely, 2^205243481 is an apocalyptic number.

It is an amenable number.

205243481 is a deficient number, since it is larger than the sum of its proper divisors (1).

205243481 is an equidigital number, since it uses as much as digits as its factorization.

205243481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 205243481 is about 14326.3212654191. The cubic root of 205243481 is about 589.8702012657.

Adding to 205243481 its reverse (184342502), we get a palindrome (389585983).

The spelling of 205243481 in words is "two hundred five million, two hundred forty-three thousand, four hundred eighty-one".