318877128281 has 2 divisors, whose sum is σ = 318877128282. Its totient is φ = 318877128280.

The previous prime is 318877128263. The next prime is 318877128301. The reversal of 318877128281 is 182821778813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171113768281 + 147763360000 = 413659^2 + 384400^2 .

It is an emirp because it is prime and its reverse (182821778813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318877128281 - 2³⁸ = 43999221337 is a prime.

It is a super-2 number, since 2×318877128281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (318877124281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159438564140 + 159438564141.

It is an arithmetic number, because the mean of its divisors is an integer number (159438564141).

Almost surely, 2^318877128281 is an apocalyptic number.

It is an amenable number.

318877128281 is a deficient number, since it is larger than the sum of its proper divisors (1).

318877128281 is an equidigital number, since it uses as much as digits as its factorization.

318877128281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2408448, while the sum is 56.

The spelling of 318877128281 in words is "three hundred eighteen billion, eight hundred seventy-seven million, one hundred twenty-eight thousand, two hundred eighty-one".