3112975781 has 2 divisors, whose sum is σ = 3112975782. Its totient is φ = 3112975780.

The previous prime is 3112975771. The next prime is 3112975783. The reversal of 3112975781 is 1875792113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2921402500 + 191573281 = 54050^2 + 13841^2 .

It is a cyclic number.

It is not a de Polignac number, because 3112975781 - 2¹⁴ = 3112959397 is a prime.

It is a super-2 number, since 2×3112975781² = 19381236426185119922, which contains 22 as substring.

Together with 3112975783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3112975783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1556487890 + 1556487891.

It is an arithmetic number, because the mean of its divisors is an integer number (1556487891).

Almost surely, 2^3112975781 is an apocalyptic number.

It is an amenable number.

3112975781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3112975781 is an equidigital number, since it uses as much as digits as its factorization.

3112975781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 44.

The square root of 3112975781 is about 55794.0478993951. The cubic root of 3112975781 is about 1460.1313106705.

The spelling of 3112975781 in words is "three billion, one hundred twelve million, nine hundred seventy-five thousand, seven hundred eighty-one".