312111139 has 2 divisors, whose sum is σ = 312111140. Its totient is φ = 312111138.

The previous prime is 312111103. The next prime is 312111167. The reversal of 312111139 is 931111213.

It is a strong prime.

It is an emirp because it is prime and its reverse (931111213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312111139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (312111179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156055569 + 156055570.

It is an arithmetic number, because the mean of its divisors is an integer number (156055570).

Almost surely, 2^312111139 is an apocalyptic number.

312111139 is a deficient number, since it is larger than the sum of its proper divisors (1).

312111139 is an equidigital number, since it uses as much as digits as its factorization.

312111139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 22.

The square root of 312111139 is about 17666.6674559748. The cubic root of 312111139 is about 678.3228123433.

The spelling of 312111139 in words is "three hundred twelve million, one hundred eleven thousand, one hundred thirty-nine".