317216749 has 2 divisors, whose sum is σ = 317216750. Its totient is φ = 317216748.

The previous prime is 317216747. The next prime is 317216789. The reversal of 317216749 is 947612713.

It is an a-pointer prime, because the next prime (317216789) can be obtained adding 317216749 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281635524 + 35581225 = 16782^2 + 5965^2 .

It is a cyclic number.

It is not a de Polignac number, because 317216749 - 2¹ = 317216747 is a prime.

It is a super-2 number, since 2×317216749² = 201252931692258002, which contains 22 as substring.

Together with 317216747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317216747) 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, 158608374 + 158608375.

It is an arithmetic number, because the mean of its divisors is an integer number (158608375).

Almost surely, 2^317216749 is an apocalyptic number.

It is an amenable number.

317216749 is a deficient number, since it is larger than the sum of its proper divisors (1).

317216749 is an equidigital number, since it uses as much as digits as its factorization.

317216749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 317216749 is about 17810.5796929802. The cubic root of 317216749 is about 682.0015630205.

The spelling of 317216749 in words is "three hundred seventeen million, two hundred sixteen thousand, seven hundred forty-nine".