2012112391 has 2 divisors, whose sum is σ = 2012112392. Its totient is φ = 2012112390.

The previous prime is 2012112379. The next prime is 2012112413. The reversal of 2012112391 is 1932112102.

It is an a-pointer prime, because the next prime (2012112413) can be obtained adding 2012112391 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2012112391 - 2¹¹ = 2012110343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2012112301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006056195 + 1006056196.

It is an arithmetic number, because the mean of its divisors is an integer number (1006056196).

Almost surely, 2^2012112391 is an apocalyptic number.

2012112391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012112391 is an equidigital number, since it uses as much as digits as its factorization.

2012112391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 2012112391 is about 44856.5757832673. The cubic root of 2012112391 is about 1262.4593753029.

Adding to 2012112391 its reverse (1932112102), we get a palindrome (3944224493).

The spelling of 2012112391 in words is "two billion, twelve million, one hundred twelve thousand, three hundred ninety-one".