1220591 has 2 divisors, whose sum is σ = 1220592.
Its totient is φ = 1220590.
The previous prime is 1220507. The next prime is 1220599. The reversal of 1220591 is 1950221.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1220591 - 214 = 1204207 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1220599) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610295 + 610296.
It is an arithmetic number, because the mean of its divisors is an integer number (610296).
21220591 is an apocalyptic number.
1220591 is a deficient number, since it is larger than the sum of its proper divisors (1).
1220591 is an equidigital number, since it uses as much as digits as its factorization.
1220591 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 180, while the sum is 20.
The square root of 1220591 is about 1104.8036024561.
The cubic root of 1220591 is about 106.8702243571.
The spelling of 1220591 in words is "one million, two hundred twenty thousand, five hundred ninety-one".