111100020091 has 2 divisors, whose sum is σ = 111100020092. Its totient is φ = 111100020090.

The previous prime is 111100020077. The next prime is 111100020103. The reversal of 111100020091 is 190020001111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111100020091 is a prime.

It is not a weakly prime, because it can be changed into another prime (111100020041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550010045 + 55550010046.

It is an arithmetic number, because the mean of its divisors is an integer number (55550010046).

Almost surely, 2^111100020091 is an apocalyptic number.

111100020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100020091 is an equidigital number, since it uses as much as digits as its factorization.

111100020091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 111100020091 in words is "one hundred eleven billion, one hundred million, twenty thousand, ninety-one".