318917897 has 2 divisors, whose sum is σ = 318917898. Its totient is φ = 318917896.

The previous prime is 318917881. The next prime is 318917899. The reversal of 318917897 is 798719813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261824761 + 57093136 = 16181^2 + 7556^2 .

It is an emirp because it is prime and its reverse (798719813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318917897 - 2⁴ = 318917881 is a prime.

Together with 318917899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318917899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159458948 + 159458949.

It is an arithmetic number, because the mean of its divisors is an integer number (159458949).

Almost surely, 2^318917897 is an apocalyptic number.

It is an amenable number.

318917897 is a deficient number, since it is larger than the sum of its proper divisors (1).

318917897 is an equidigital number, since it uses as much as digits as its factorization.

318917897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 53.

The square root of 318917897 is about 17858.2725088403. The cubic root of 318917897 is about 683.2185204420.

The spelling of 318917897 in words is "three hundred eighteen million, nine hundred seventeen thousand, eight hundred ninety-seven".