283221217 has 2 divisors, whose sum is σ = 283221218. Its totient is φ = 283221216.

The previous prime is 283221209. The next prime is 283221233. The reversal of 283221217 is 712122382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227285776 + 55935441 = 15076^2 + 7479^2 .

It is a cyclic number.

It is not a de Polignac number, because 283221217 - 2³ = 283221209 is a prime.

It is a super-2 number, since 2×283221217² = 160428515517922178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (283221247) 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, 141610608 + 141610609.

It is an arithmetic number, because the mean of its divisors is an integer number (141610609).

Almost surely, 2^283221217 is an apocalyptic number.

It is an amenable number.

283221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

283221217 is an equidigital number, since it uses as much as digits as its factorization.

283221217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 283221217 is about 16829.1775497200. The cubic root of 283221217 is about 656.7124678244.

Adding to 283221217 its reverse (712122382), we get a palindrome (995343599).

The spelling of 283221217 in words is "two hundred eighty-three million, two hundred twenty-one thousand, two hundred seventeen".