112312321991 has 2 divisors, whose sum is σ = 112312321992. Its totient is φ = 112312321990.

The previous prime is 112312321973. The next prime is 112312322141. The reversal of 112312321991 is 199123213211.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-112312321991 is a prime.

It is a super-2 number, since 2×112312321991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (112312321951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56156160995 + 56156160996.

It is an arithmetic number, because the mean of its divisors is an integer number (56156160996).

Almost surely, 2^112312321991 is an apocalyptic number.

112312321991 is a deficient number, since it is larger than the sum of its proper divisors (1).

112312321991 is an equidigital number, since it uses as much as digits as its factorization.

112312321991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The spelling of 112312321991 in words is "one hundred twelve billion, three hundred twelve million, three hundred twenty-one thousand, nine hundred ninety-one".