91111111067 has 2 divisors, whose sum is σ = 91111111068. Its totient is φ = 91111111066.

The previous prime is 91111111009. The next prime is 91111111073. The reversal of 91111111067 is 76011111119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91111111067 - 2¹⁰ = 91111110043 is a prime.

It is not a weakly prime, because it can be changed into another prime (91111111367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45555555533 + 45555555534.

It is an arithmetic number, because the mean of its divisors is an integer number (45555555534).

Almost surely, 2^91111111067 is an apocalyptic number.

91111111067 is a deficient number, since it is larger than the sum of its proper divisors (1).

91111111067 is an equidigital number, since it uses as much as digits as its factorization.

91111111067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 29.

The spelling of 91111111067 in words is "ninety-one billion, one hundred eleven million, one hundred eleven thousand, sixty-seven".