312111113 has 4 divisors (see below), whose sum is σ = 312961920. Its totient is φ = 311260308.

The previous prime is 312111103. The next prime is 312111139. The reversal of 312111113 is 311111213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 311111213 = 7 ⋅44444459.

It is a cyclic number.

It is not a de Polignac number, because 312111113 - 2¹⁴ = 312094729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312111103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424853 + ... + 425586.

It is an arithmetic number, because the mean of its divisors is an integer number (78240480).

Almost surely, 2^312111113 is an apocalyptic number.

It is an amenable number.

312111113 is a deficient number, since it is larger than the sum of its proper divisors (850807).

312111113 is an equidigital number, since it uses as much as digits as its factorization.

312111113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850806.

The product of its digits is 18, while the sum is 14.

The square root of 312111113 is about 17666.6667201258. Note that the first 3 decimals coincide. The cubic root of 312111113 is about 678.3227935077.

Adding to 312111113 its reverse (311111213), we get a palindrome (623222326).

The spelling of 312111113 in words is "three hundred twelve million, one hundred eleven thousand, one hundred thirteen".