221489 has 2 divisors, whose sum is σ = 221490. Its totient is φ = 221488.

The previous prime is 221477. The next prime is 221497. The reversal of 221489 is 984122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193600 + 27889 = 440^2 + 167^2 .

It is a cyclic number.

It is not a de Polignac number, because 221489 - 2⁸ = 221233 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110744 + 110745.

It is an arithmetic number, because the mean of its divisors is an integer number (110745).

2²²¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

221489 is a deficient number, since it is larger than the sum of its proper divisors (1).

221489 is an equidigital number, since it uses as much as digits as its factorization.

221489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 221489 is about 470.6261786174. The cubic root of 221489 is about 60.5039953649.

The spelling of 221489 in words is "two hundred twenty-one thousand, four hundred eighty-nine".