2112231991 has 2 divisors, whose sum is σ = 2112231992. Its totient is φ = 2112231990.

The previous prime is 2112231983. The next prime is 2112232007. The reversal of 2112231991 is 1991322112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2112231991 - 2³ = 2112231983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112231931) 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, 1056115995 + 1056115996.

It is an arithmetic number, because the mean of its divisors is an integer number (1056115996).

Almost surely, 2^2112231991 is an apocalyptic number.

2112231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112231991 is an equidigital number, since it uses as much as digits as its factorization.

2112231991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 2112231991 is about 45959.0251310882. The cubic root of 2112231991 is about 1283.0607074941.

The spelling of 2112231991 in words is "two billion, one hundred twelve million, two hundred thirty-one thousand, nine hundred ninety-one".