317320261 has 2 divisors, whose sum is σ = 317320262. Its totient is φ = 317320260.

The previous prime is 317320243. The next prime is 317320277. The reversal of 317320261 is 162023713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182412036 + 134908225 = 13506^2 + 11615^2 .

It is an emirp because it is prime and its reverse (162023713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317320261 - 2¹³ = 317312069 is a prime.

It is a super-2 number, since 2×317320261² = 201384296082216242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317390261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158660130 + 158660131.

It is an arithmetic number, because the mean of its divisors is an integer number (158660131).

Almost surely, 2^317320261 is an apocalyptic number.

It is an amenable number.

317320261 is a deficient number, since it is larger than the sum of its proper divisors (1).

317320261 is an equidigital number, since it uses as much as digits as its factorization.

317320261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 317320261 is about 17813.4853692364. The cubic root of 317320261 is about 682.0757369816.

Adding to 317320261 its reverse (162023713), we get a palindrome (479343974).

The spelling of 317320261 in words is "three hundred seventeen million, three hundred twenty thousand, two hundred sixty-one".