1317221 has 4 divisors (see below), whose sum is σ = 1359744. Its totient is φ = 1274700.

The previous prime is 1317193. The next prime is 1317223. The reversal of 1317221 is 1227131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1317221 - 2⁶ = 1317157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1317221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21215 + ... + 21276.

It is an arithmetic number, because the mean of its divisors is an integer number (339936).

2^1317221 is an apocalyptic number.

It is an amenable number.

1317221 is a deficient number, since it is larger than the sum of its proper divisors (42523).

1317221 is an equidigital number, since it uses as much as digits as its factorization.

1317221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42522.

The product of its digits is 84, while the sum is 17.

The square root of 1317221 is about 1147.7024875812. The cubic root of 1317221 is about 109.6190957634.

The spelling of 1317221 in words is "one million, three hundred seventeen thousand, two hundred twenty-one".