312111111 has 16 divisors (see below), whose sum is σ = 451136000. Its totient is φ = 190792800.

The previous prime is 312111103. The next prime is 312111139. The reversal of 312111111 is 111111213.

It is not a de Polignac number, because 312111111 - 2³ = 312111103 is a prime.

It is a Duffinian number.

312111111 is a modest number, since divided by 11111 gives 3121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312110111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20611 + ... + 32388.

It is an arithmetic number, because the mean of its divisors is an integer number (28196000).

Almost surely, 2^312111111 is an apocalyptic number.

312111111 is a deficient number, since it is larger than the sum of its proper divisors (139024889).

312111111 is a wasteful number, since it uses less digits than its factorization.

312111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53166.

The product of its digits is 6, while the sum is 12.

The square root of 312111111 is about 17666.6666635220. Note that the first 5 decimals coincide. The cubic root of 312111111 is about 678.3227920588.

Adding to 312111111 its reverse (111111213), we get a palindrome (423222324).

The spelling of 312111111 in words is "three hundred twelve million, one hundred eleven thousand, one hundred eleven".