312123121988 has 12 divisors (see below), whose sum is σ = 546328890492. Its totient is φ = 156029153280.

The previous prime is 312123121987. The next prime is 312123122053. The reversal of 312123121988 is 889121321213.

It can be written as a sum of positive squares in 2 ways, for example, as 51878261824 + 260244860164 = 227768^2 + 510142^2 .

It is a super-3 number, since 3×312123121988³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (312123121987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8080253 + ... + 8118788.

It is an arithmetic number, because the mean of its divisors is an integer number (45527407541).

Almost surely, 2^312123121988 is an apocalyptic number.

It is an amenable number.

312123121988 is a deficient number, since it is larger than the sum of its proper divisors (234205768504).

312123121988 is a wasteful number, since it uses less digits than its factorization.

312123121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16203862 (or 16203860 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The spelling of 312123121988 in words is "three hundred twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, nine hundred eighty-eight".