317947247 has 2 divisors, whose sum is σ = 317947248. Its totient is φ = 317947246.

The previous prime is 317947237. The next prime is 317947291. The reversal of 317947247 is 742749713.

It is an a-pointer prime, because the next prime (317947291) can be obtained adding 317947247 to its sum of digits (44).

It is a weak prime.

It is an emirp because it is prime and its reverse (742749713) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317947247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 317947198 and 317947207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317947237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158973623 + 158973624.

It is an arithmetic number, because the mean of its divisors is an integer number (158973624).

Almost surely, 2^317947247 is an apocalyptic number.

317947247 is a deficient number, since it is larger than the sum of its proper divisors (1).

317947247 is an equidigital number, since it uses as much as digits as its factorization.

317947247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 44.

The square root of 317947247 is about 17831.0753181069. The cubic root of 317947247 is about 682.5246741561.

The spelling of 317947247 in words is "three hundred seventeen million, nine hundred forty-seven thousand, two hundred forty-seven".