890221 has 2 divisors, whose sum is σ = 890222. Its totient is φ = 890220.

The previous prime is 890177. The next prime is 890231. The reversal of 890221 is 122098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855625 + 34596 = 925^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 890221 - 2¹³ = 882029 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 890192 and 890201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445110 + 445111.

It is an arithmetic number, because the mean of its divisors is an integer number (445111).

2⁸⁹⁰²²¹ is an apocalyptic number.

It is an amenable number.

890221 is a deficient number, since it is larger than the sum of its proper divisors (1).

890221 is an equidigital number, since it uses as much as digits as its factorization.

890221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 890221 is about 943.5152357010. The cubic root of 890221 is about 96.1979782973.

It can be divided in two parts, 890 and 221, that added together give a palindrome (1111).

The spelling of 890221 in words is "eight hundred ninety thousand, two hundred twenty-one".