318707813 has 2 divisors, whose sum is σ = 318707814. Its totient is φ = 318707812.

The previous prime is 318707783. The next prime is 318707819.

318707813 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304921444 + 13786369 = 17462^2 + 3713^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 318707813 - 2⁶ = 318707749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318707819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159353906 + 159353907.

It is an arithmetic number, because the mean of its divisors is an integer number (159353907).

Almost surely, 2^318707813 is an apocalyptic number.

It is an amenable number.

318707813 is a deficient number, since it is larger than the sum of its proper divisors (1).

318707813 is an equidigital number, since it uses as much as digits as its factorization.

318707813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 318707813 is about 17852.3895599441. The cubic root of 318707813 is about 683.0684663480.

The spelling of 318707813 in words is "three hundred eighteen million, seven hundred seven thousand, eight hundred thirteen".