111000000091 has 2 divisors, whose sum is σ = 111000000092. Its totient is φ = 111000000090.

The previous prime is 111000000079. The next prime is 111000000101. The reversal of 111000000091 is 190000000111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111000000091 is a prime.

It is not a weakly prime, because it can be changed into another prime (111000000071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500000045 + 55500000046.

It is an arithmetic number, because the mean of its divisors is an integer number (55500000046).

Almost surely, 2^111000000091 is an apocalyptic number.

111000000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

111000000091 is an equidigital number, since it uses as much as digits as its factorization.

111000000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 13.

The spelling of 111000000091 in words is "one hundred eleven billion, ninety-one", and thus it is an aban number.