317421281 has 2 divisors, whose sum is σ = 317421282. Its totient is φ = 317421280.

The previous prime is 317421233. The next prime is 317421287. The reversal of 317421281 is 182124713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 292581025 + 24840256 = 17105^2 + 4984^2 .

It is an emirp because it is prime and its reverse (182124713) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317421281 is a prime.

It is a super-2 number, since 2×317421281² = 201512539263361922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (317421287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158710640 + 158710641.

It is an arithmetic number, because the mean of its divisors is an integer number (158710641).

Almost surely, 2^317421281 is an apocalyptic number.

It is an amenable number.

317421281 is a deficient number, since it is larger than the sum of its proper divisors (1).

317421281 is an equidigital number, since it uses as much as digits as its factorization.

317421281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 317421281 is about 17816.3206358664. The cubic root of 317421281 is about 682.1481096903.

Adding to 317421281 its reverse (182124713), we get a palindrome (499545994).

The spelling of 317421281 in words is "three hundred seventeen million, four hundred twenty-one thousand, two hundred eighty-one".