383221 has 2 divisors, whose sum is σ = 383222. Its totient is φ = 383220.

The previous prime is 383219. The next prime is 383261. The reversal of 383221 is 122383.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264196 + 119025 = 514^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 383221 - 2¹ = 383219 is a prime.

Together with 383219, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (383261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191610 + 191611.

It is an arithmetic number, because the mean of its divisors is an integer number (191611).

2³⁸³²²¹ is an apocalyptic number.

It is an amenable number.

383221 is a deficient number, since it is larger than the sum of its proper divisors (1).

383221 is an equidigital number, since it uses as much as digits as its factorization.

383221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 383221 is about 619.0484633694. The cubic root of 383221 is about 72.6356398511.

The spelling of 383221 in words is "three hundred eighty-three thousand, two hundred twenty-one".