221849 has 2 divisors, whose sum is σ = 221850. Its totient is φ = 221848.

The previous prime is 221831. The next prime is 221873. The reversal of 221849 is 948122.

221849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196249 + 25600 = 443^2 + 160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221849 is a prime.

It is an Ulam number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221849.

It is not a weakly prime, because it can be changed into another prime (221549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110924 + 110925.

It is an arithmetic number, because the mean of its divisors is an integer number (110925).

221849 is a Friedman number, since it can be written as (2^9-41)^2+8, using all its digits and the basic arithmetic operations.

2²²¹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

221849 is a deficient number, since it is larger than the sum of its proper divisors (1).

221849 is an equidigital number, since it uses as much as digits as its factorization.

221849 is an odious number, because the sum of its binary digits is odd.

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

The square root of 221849 is about 471.0084924924. The cubic root of 221849 is about 60.5367579371.

The spelling of 221849 in words is "two hundred twenty-one thousand, eight hundred forty-nine".