312819921687 has 32 divisors (see below), whose sum is σ = 513732954112. Its totient is φ = 164879380224.

The previous prime is 312819921629. The next prime is 312819921731. The reversal of 312819921687 is 786129918213.

It is not a de Polignac number, because 312819921687 - 2⁸ = 312819921431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312819921607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69478 + ... + 794019.

It is an arithmetic number, because the mean of its divisors is an integer number (16054154816).

Almost surely, 2^312819921687 is an apocalyptic number.

312819921687 is a deficient number, since it is larger than the sum of its proper divisors (200913032425).

312819921687 is a wasteful number, since it uses less digits than its factorization.

312819921687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864847.

The product of its digits is 2612736, while the sum is 57.

The spelling of 312819921687 in words is "three hundred twelve billion, eight hundred nineteen million, nine hundred twenty-one thousand, six hundred eighty-seven".