282381221 has 2 divisors, whose sum is σ = 282381222. Its totient is φ = 282381220.

The previous prime is 282381193. The next prime is 282381223. The reversal of 282381221 is 122183282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252460321 + 29920900 = 15889^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 282381221 - 2⁶ = 282381157 is a prime.

Together with 282381223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (282381223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 141190610 + 141190611.

It is an arithmetic number, because the mean of its divisors is an integer number (141190611).

Almost surely, 2^282381221 is an apocalyptic number.

It is an amenable number.

282381221 is a deficient number, since it is larger than the sum of its proper divisors (1).

282381221 is an equidigital number, since it uses as much as digits as its factorization.

282381221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 29.

The square root of 282381221 is about 16804.2024803321. The cubic root of 282381221 is about 656.0625846559.

The spelling of 282381221 in words is "two hundred eighty-two million, three hundred eighty-one thousand, two hundred twenty-one".