317128879 has 2 divisors, whose sum is σ = 317128880. Its totient is φ = 317128878.

The previous prime is 317128873. The next prime is 317128883. The reversal of 317128879 is 978821713.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317128879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317128873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158564439 + 158564440.

It is an arithmetic number, because the mean of its divisors is an integer number (158564440).

Almost surely, 2^317128879 is an apocalyptic number.

317128879 is a deficient number, since it is larger than the sum of its proper divisors (1).

317128879 is an equidigital number, since it uses as much as digits as its factorization.

317128879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 46.

The square root of 317128879 is about 17808.1127298768. The cubic root of 317128879 is about 681.9385850391.

The spelling of 317128879 in words is "three hundred seventeen million, one hundred twenty-eight thousand, eight hundred seventy-nine".