3112126781 has 2 divisors, whose sum is σ = 3112126782. Its totient is φ = 3112126780.

The previous prime is 3112126733. The next prime is 3112126817. The reversal of 3112126781 is 1876212113.

Together with next prime (3112126817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3009509881 + 102616900 = 54859^2 + 10130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3112126781 is a prime.

It is a super-2 number, since 2×3112126781² = 19370666202034843922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3112126181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1556063390 + 1556063391.

It is an arithmetic number, because the mean of its divisors is an integer number (1556063391).

Almost surely, 2^3112126781 is an apocalyptic number.

It is an amenable number.

3112126781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3112126781 is an equidigital number, since it uses as much as digits as its factorization.

3112126781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 32.

The square root of 3112126781 is about 55786.4390421185. The cubic root of 3112126781 is about 1459.9985583585.

Adding to 3112126781 its reverse (1876212113), we get a palindrome (4988338894).

The spelling of 3112126781 in words is "three billion, one hundred twelve million, one hundred twenty-six thousand, seven hundred eighty-one".