111101111001091 has 4 divisors (see below), whose sum is σ = 112507454178400. Its totient is φ = 109694767823784.

The previous prime is 111101111001007. The next prime is 111101111001107. The reversal of 111101111001091 is 190100111101111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111101111001091 - 2¹⁷ = 111101110870019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111101111008091) 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 in 3 ways as a sum of consecutive naturals, for example, 703171588536 + ... + 703171588693.

It is an arithmetic number, because the mean of its divisors is an integer number (28126863544600).

Almost surely, 2^{111101111001091} is an apocalyptic number.

111101111001091 is a deficient number, since it is larger than the sum of its proper divisors (1406343177309).

111101111001091 is an equidigital number, since it uses as much as digits as its factorization.

111101111001091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406343177308.

The product of its (nonzero) digits is 9, while the sum is 19.

The spelling of 111101111001091 in words is "one hundred eleven trillion, one hundred one billion, one hundred eleven million, one thousand, ninety-one".