313218137 has 2 divisors, whose sum is σ = 313218138. Its totient is φ = 313218136.

The previous prime is 313218127. The next prime is 313218151. The reversal of 313218137 is 731812313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 300120976 + 13097161 = 17324^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 313218137 - 2⁸ = 313217881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (313218127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156609068 + 156609069.

It is an arithmetic number, because the mean of its divisors is an integer number (156609069).

Almost surely, 2^313218137 is an apocalyptic number.

It is an amenable number.

313218137 is a deficient number, since it is larger than the sum of its proper divisors (1).

313218137 is an equidigital number, since it uses as much as digits as its factorization.

313218137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 313218137 is about 17697.9698553252. The cubic root of 313218137 is about 679.1238261275.

The spelling of 313218137 in words is "three hundred thirteen million, two hundred eighteen thousand, one hundred thirty-seven".