318861188117 has 2 divisors, whose sum is σ = 318861188118. Its totient is φ = 318861188116.

The previous prime is 318861188099. The next prime is 318861188147. The reversal of 318861188117 is 711881168813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219767814436 + 99093373681 = 468794^2 + 314791^2 .

It is an emirp because it is prime and its reverse (711881168813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318861188117 - 2⁶ = 318861188053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318861188147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159430594058 + 159430594059.

It is an arithmetic number, because the mean of its divisors is an integer number (159430594059).

Almost surely, 2^318861188117 is an apocalyptic number.

It is an amenable number.

318861188117 is a deficient number, since it is larger than the sum of its proper divisors (1).

318861188117 is an equidigital number, since it uses as much as digits as its factorization.

318861188117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 53.

The spelling of 318861188117 in words is "three hundred eighteen billion, eight hundred sixty-one million, one hundred eighty-eight thousand, one hundred seventeen".