317221 has 4 divisors (see below), whose sum is σ = 319500. Its totient is φ = 314944.

The previous prime is 317209. The next prime is 317227. The reversal of 317221 is 122713.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57121 + 260100 = 239^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 317221 - 2⁵ = 317189 is a prime.

It is an Ulam number.

It is a Duffinian number.

317221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 317195 and 317204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317227) 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, 916 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (79875).

2³¹⁷²²¹ is an apocalyptic number.

It is an amenable number.

317221 is a deficient number, since it is larger than the sum of its proper divisors (2279).

317221 is a wasteful number, since it uses less digits than its factorization.

317221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278.

The product of its digits is 84, while the sum is 16.

The square root of 317221 is about 563.2237566012. The cubic root of 317221 is about 68.2004609492.

Adding to 317221 its reverse (122713), we get a palindrome (439934).

The spelling of 317221 in words is "three hundred seventeen thousand, two hundred twenty-one", and thus it is an iban number.