281363213 has 2 divisors, whose sum is σ = 281363214. Its totient is φ = 281363212.

The previous prime is 281363179. The next prime is 281363227. The reversal of 281363213 is 312363182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228553924 + 52809289 = 15118^2 + 7267^2 .

It is a cyclic number.

It is not a de Polignac number, because 281363213 - 2⁸ = 281362957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281360213) 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, 140681606 + 140681607.

It is an arithmetic number, because the mean of its divisors is an integer number (140681607).

Almost surely, 2^281363213 is an apocalyptic number.

It is an amenable number.

281363213 is a deficient number, since it is larger than the sum of its proper divisors (1).

281363213 is an equidigital number, since it uses as much as digits as its factorization.

281363213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 281363213 is about 16773.8848511607. The cubic root of 281363213 is about 655.2732484614.

The spelling of 281363213 in words is "two hundred eighty-one million, three hundred sixty-three thousand, two hundred thirteen".