1089221 has 6 divisors (see below), whose sum is σ = 1267110. Its totient is φ = 933576.

The previous prime is 1089217. The next prime is 1089223. The reversal of 1089221 is 1229801.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 261121 = 910^2 + 511^2 .

It is not a de Polignac number, because 1089221 - 2² = 1089217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11066 + ... + 11163.

It is an arithmetic number, because the mean of its divisors is an integer number (211185).

2^1089221 is an apocalyptic number.

It is an amenable number.

1089221 is a deficient number, since it is larger than the sum of its proper divisors (177889).

1089221 is an equidigital number, since it uses as much as digits as its factorization.

1089221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22243 (or 22236 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1089221 is about 1043.6575108722. The cubic root of 1089221 is about 102.8897239341.

The spelling of 1089221 in words is "one million, eighty-nine thousand, two hundred twenty-one".