281982497 has 2 divisors, whose sum is σ = 281982498. Its totient is φ = 281982496.

The previous prime is 281982487. The next prime is 281982499. The reversal of 281982497 is 794289182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281702656 + 279841 = 16784^2 + 529^2 .

It is a cyclic number.

It is not a de Polignac number, because 281982497 - 2⁸ = 281982241 is a prime.

It is a super-2 number, since 2×281982497² = 159028257228710018, which contains 22 as substring.

Together with 281982499, 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 (281982499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140991248 + 140991249.

It is an arithmetic number, because the mean of its divisors is an integer number (140991249).

Almost surely, 2^281982497 is an apocalyptic number.

It is an amenable number.

281982497 is a deficient number, since it is larger than the sum of its proper divisors (1).

281982497 is an equidigital number, since it uses as much as digits as its factorization.

281982497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The square root of 281982497 is about 16792.3344714188. The cubic root of 281982497 is about 655.7536510861.

The spelling of 281982497 in words is "two hundred eighty-one million, nine hundred eighty-two thousand, four hundred ninety-seven".