312878956321 has 4 divisors (see below), whose sum is σ = 313045649172. Its totient is φ = 312712263472.

The previous prime is 312878956319. The next prime is 312878956339. The reversal of 312878956321 is 123659878213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123659878213 = 263 ⋅470189651.

It can be written as a sum of positive squares in 2 ways, for example, as 124383182400 + 188495773921 = 352680^2 + 434161^2 .

It is a cyclic number.

It is not a de Polignac number, because 312878956321 - 2¹ = 312878956319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312878956301) 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, 83343610 + ... + 83347363.

It is an arithmetic number, because the mean of its divisors is an integer number (78261412293).

Almost surely, 2^312878956321 is an apocalyptic number.

It is an amenable number.

312878956321 is a deficient number, since it is larger than the sum of its proper divisors (166692851).

312878956321 is a wasteful number, since it uses less digits than its factorization.

312878956321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166692850.

The product of its digits is 4354560, while the sum is 55.

The spelling of 312878956321 in words is "three hundred twelve billion, eight hundred seventy-eight million, nine hundred fifty-six thousand, three hundred twenty-one".