1097221 has 2 divisors, whose sum is σ = 1097222. Its totient is φ = 1097220.

The previous prime is 1097209. The next prime is 1097237. The reversal of 1097221 is 1227901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 408321 = 830^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 1097221 - 2⁵ = 1097189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1097192 and 1097201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1097321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548610 + 548611.

It is an arithmetic number, because the mean of its divisors is an integer number (548611).

2^1097221 is an apocalyptic number.

It is an amenable number.

1097221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1097221 is an equidigital number, since it uses as much as digits as its factorization.

1097221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1097221 is about 1047.4831740892. The cubic root of 1097221 is about 103.1410077385.

The spelling of 1097221 in words is "one million, ninety-seven thousand, two hundred twenty-one".