312543886691 has 4 divisors (see below), whose sum is σ = 322625947584. Its totient is φ = 302461825800.

The previous prime is 312543886667. The next prime is 312543886703. The reversal of 312543886691 is 196688345213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312543886691 is a prime.

It is a super-2 number, since 2×312543886691² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312543886601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5041030400 + ... + 5041030461.

It is an arithmetic number, because the mean of its divisors is an integer number (80656486896).

Almost surely, 2^312543886691 is an apocalyptic number.

312543886691 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

312543886691 is a deficient number, since it is larger than the sum of its proper divisors (10082060893).

312543886691 is a wasteful number, since it uses less digits than its factorization.

312543886691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10082060892.

The product of its digits is 7464960, while the sum is 56.

The spelling of 312543886691 in words is "three hundred twelve billion, five hundred forty-three million, eight hundred eighty-six thousand, six hundred ninety-one".