312131112211 has 4 divisors (see below), whose sum is σ = 314588837632. Its totient is φ = 309673386792.

The previous prime is 312131112199. The next prime is 312131112269. The reversal of 312131112211 is 112211131213.

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

It is a cyclic number.

It is not a de Polignac number, because 312131112211 - 2¹⁵ = 312131079443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312131112011) 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, 1228862520 + ... + 1228862773.

It is an arithmetic number, because the mean of its divisors is an integer number (78647209408).

Almost surely, 2^312131112211 is an apocalyptic number.

312131112211 is a deficient number, since it is larger than the sum of its proper divisors (2457725421).

312131112211 is a wasteful number, since it uses less digits than its factorization.

312131112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457725420.

The product of its digits is 72, while the sum is 19.

Adding to 312131112211 its reverse (112211131213), we get a palindrome (424342243424).

The spelling of 312131112211 in words is "three hundred twelve billion, one hundred thirty-one million, one hundred twelve thousand, two hundred eleven".