1098221 has 2 divisors, whose sum is σ = 1098222. Its totient is φ = 1098220.

The previous prime is 1098211. The next prime is 1098233. The reversal of 1098221 is 1228901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972196 + 126025 = 986^2 + 355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549110 + 549111.

It is an arithmetic number, because the mean of its divisors is an integer number (549111).

2^1098221 is an apocalyptic number.

It is an amenable number.

1098221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098221 is an equidigital number, since it uses as much as digits as its factorization.

1098221 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 23.

The square root of 1098221 is about 1047.9604000152. The cubic root of 1098221 is about 103.1723322360.

The spelling of 1098221 in words is "one million, ninety-eight thousand, two hundred twenty-one".