111012231991 has 2 divisors, whose sum is σ = 111012231992. Its totient is φ = 111012231990.

The previous prime is 111012231977. The next prime is 111012232027. The reversal of 111012231991 is 199132210111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111012231991 - 2⁹ = 111012231479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111012211991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55506115995 + 55506115996.

It is an arithmetic number, because the mean of its divisors is an integer number (55506115996).

Almost surely, 2^111012231991 is an apocalyptic number.

111012231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

111012231991 is an equidigital number, since it uses as much as digits as its factorization.

111012231991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 31.

The spelling of 111012231991 in words is "one hundred eleven billion, twelve million, two hundred thirty-one thousand, nine hundred ninety-one".