317310221 has 4 divisors (see below), whose sum is σ = 319626492. Its totient is φ = 314993952.

The previous prime is 317310211. The next prime is 317310229. The reversal of 317310221 is 122013713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122013713 = 71 ⋅1718503.

It can be written as a sum of positive squares in 2 ways, for example, as 148596100 + 168714121 = 12190^2 + 12989^2 .

It is a cyclic number.

It is not a de Polignac number, because 317310221 - 2⁶ = 317310157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 317310193 and 317310202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317310229) 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, 1157930 + ... + 1158203.

It is an arithmetic number, because the mean of its divisors is an integer number (79906623).

Almost surely, 2^317310221 is an apocalyptic number.

It is an amenable number.

317310221 is a deficient number, since it is larger than the sum of its proper divisors (2316271).

317310221 is a wasteful number, since it uses less digits than its factorization.

317310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316270.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 317310221 is about 17813.2035580353. The cubic root of 317310221 is about 682.0685432897.

Adding to 317310221 its reverse (122013713), we get a palindrome (439323934).

The spelling of 317310221 in words is "three hundred seventeen million, three hundred ten thousand, two hundred twenty-one".