111121013891 has 2 divisors, whose sum is σ = 111121013892. Its totient is φ = 111121013890.

The previous prime is 111121013881. The next prime is 111121013897. The reversal of 111121013891 is 198310121111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111121013891 - 2¹⁰ = 111121012867 is a prime.

It is not a weakly prime, because it can be changed into another prime (111121013897) 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, 55560506945 + 55560506946.

It is an arithmetic number, because the mean of its divisors is an integer number (55560506946).

Almost surely, 2^111121013891 is an apocalyptic number.

111121013891 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121013891 is an equidigital number, since it uses as much as digits as its factorization.

111121013891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 29.

The spelling of 111121013891 in words is "one hundred eleven billion, one hundred twenty-one million, thirteen thousand, eight hundred ninety-one".