111111222111091 has 2 divisors, whose sum is σ = 111111222111092. Its totient is φ = 111111222111090.

The previous prime is 111111222111047. The next prime is 111111222111143. The reversal of 111111222111091 is 190111222111111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111111222111091 - 2¹⁵ = 111111222078323 is a prime.

It is not a weakly prime, because it can be changed into another prime (111111222111031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555611055545 + 55555611055546.

It is an arithmetic number, because the mean of its divisors is an integer number (55555611055546).

Almost surely, 2^{111111222111091} is an apocalyptic number.

111111222111091 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111222111091 is an equidigital number, since it uses as much as digits as its factorization.

111111222111091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 25.

The spelling of 111111222111091 in words is "one hundred eleven trillion, one hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, ninety-one".