1220171 has 2 divisors, whose sum is σ = 1220172. Its totient is φ = 1220170.

The previous prime is 1220147. The next prime is 1220203. The reversal of 1220171 is 1710221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1710221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220171 - 2¹⁰ = 1219147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1220071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610085 + 610086.

It is an arithmetic number, because the mean of its divisors is an integer number (610086).

2^1220171 is an apocalyptic number.

1220171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220171 is an equidigital number, since it uses as much as digits as its factorization.

1220171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 1220171 is about 1104.6135070693. The cubic root of 1220171 is about 106.8579650927.

Adding to 1220171 its reverse (1710221), we get a palindrome (2930392).

The spelling of 1220171 in words is "one million, two hundred twenty thousand, one hundred seventy-one".