317491261 has 2 divisors, whose sum is σ = 317491262. Its totient is φ = 317491260.

The previous prime is 317491247. The next prime is 317491267. The reversal of 317491261 is 162194713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187964100 + 129527161 = 13710^2 + 11381^2 .

It is a cyclic number.

It is not a de Polignac number, because 317491261 - 2¹¹ = 317489213 is a prime.

It is a super-2 number, since 2×317491261² = 201601401622740242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317491267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158745630 + 158745631.

It is an arithmetic number, because the mean of its divisors is an integer number (158745631).

Almost surely, 2^317491261 is an apocalyptic number.

It is an amenable number.

317491261 is a deficient number, since it is larger than the sum of its proper divisors (1).

317491261 is an equidigital number, since it uses as much as digits as its factorization.

317491261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 317491261 is about 17818.2844572647. The cubic root of 317491261 is about 682.1982357319.

The spelling of 317491261 in words is "three hundred seventeen million, four hundred ninety-one thousand, two hundred sixty-one".