312011111 has 2 divisors, whose sum is σ = 312011112. Its totient is φ = 312011110.

The previous prime is 312011093. The next prime is 312011137. The reversal of 312011111 is 111110213.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (111110213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312011111 - 2¹⁰ = 312010087 is a prime.

It is a Chen prime.

312011111 is a modest number, since divided by 11111 gives 3120 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 312011092 and 312011101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312011171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156005555 + 156005556.

It is an arithmetic number, because the mean of its divisors is an integer number (156005556).

Almost surely, 2^312011111 is an apocalyptic number.

312011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

312011111 is an equidigital number, since it uses as much as digits as its factorization.

312011111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 312011111 is about 17663.8362481087. The cubic root of 312011111 is about 678.2503397360.

Adding to 312011111 its reverse (111110213), we get a palindrome (423121324).

The spelling of 312011111 in words is "three hundred twelve million, eleven thousand, one hundred eleven".