281908241 has 2 divisors, whose sum is σ = 281908242. Its totient is φ = 281908240.

The previous prime is 281908223. The next prime is 281908247. The reversal of 281908241 is 142809182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234243025 + 47665216 = 15305^2 + 6904^2 .

It is a cyclic number.

It is not a de Polignac number, because 281908241 - 2⁶ = 281908177 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (281908247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140954120 + 140954121.

It is an arithmetic number, because the mean of its divisors is an integer number (140954121).

Almost surely, 2^281908241 is an apocalyptic number.

It is an amenable number.

281908241 is a deficient number, since it is larger than the sum of its proper divisors (1).

281908241 is an equidigital number, since it uses as much as digits as its factorization.

281908241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 281908241 is about 16790.1233169980. The cubic root of 281908241 is about 655.6960849623.

The spelling of 281908241 in words is "two hundred eighty-one million, nine hundred eight thousand, two hundred forty-one".