633221 has 2 divisors, whose sum is σ = 633222. Its totient is φ = 633220.

The previous prime is 633209. The next prime is 633253. The reversal of 633221 is 122336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372100 + 261121 = 610^2 + 511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-633221 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 633221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (633271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316610 + 316611.

It is an arithmetic number, because the mean of its divisors is an integer number (316611).

2⁶³³²²¹ is an apocalyptic number.

It is an amenable number.

633221 is a deficient number, since it is larger than the sum of its proper divisors (1).

633221 is an equidigital number, since it uses as much as digits as its factorization.

633221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 17.

The square root of 633221 is about 795.7518457409. The cubic root of 633221 is about 85.8720379272.

Adding to 633221 its reverse (122336), we get a palindrome (755557).

The spelling of 633221 in words is "six hundred thirty-three thousand, two hundred twenty-one".