1221097 has 2 divisors, whose sum is σ = 1221098.
Its totient is φ = 1221096.
The previous prime is 1221089. The next prime is 1221113. The reversal of 1221097 is 7901221.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1201216 + 19881 = 1096^2 + 141^2
It is a cyclic number.
It is not a de Polignac number, because 1221097 - 23 = 1221089 is a prime.
It is not a weakly prime, because it can be changed into another prime (1221197) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610548 + 610549.
It is an arithmetic number, because the mean of its divisors is an integer number (610549).
21221097 is an apocalyptic number.
It is an amenable number.
1221097 is a deficient number, since it is larger than the sum of its proper divisors (1).
1221097 is an equidigital number, since it uses as much as digits as its factorization.
1221097 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 252, while the sum is 22.
The square root of 1221097 is about 1105.0325787053.
The cubic root of 1221097 is about 106.8849901175.
The spelling of 1221097 in words is "one million, two hundred twenty-one thousand, ninety-seven".