318554207981 has 2 divisors, whose sum is σ = 318554207982. Its totient is φ = 318554207980.

The previous prime is 318554207947. The next prime is 318554208001. The reversal of 318554207981 is 189702455813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197039219881 + 121514988100 = 443891^2 + 348590^2 .

It is a cyclic number.

It is not a de Polignac number, because 318554207981 - 2³⁰ = 317480466157 is a prime.

It is a super-2 number, since 2×318554207981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318554207281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159277103990 + 159277103991.

It is an arithmetic number, because the mean of its divisors is an integer number (159277103991).

Almost surely, 2^318554207981 is an apocalyptic number.

It is an amenable number.

318554207981 is a deficient number, since it is larger than the sum of its proper divisors (1).

318554207981 is an equidigital number, since it uses as much as digits as its factorization.

318554207981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2419200, while the sum is 53.

The spelling of 318554207981 in words is "three hundred eighteen billion, five hundred fifty-four million, two hundred seven thousand, nine hundred eighty-one".