91109667071 has 2 divisors, whose sum is σ = 91109667072. Its totient is φ = 91109667070.

The previous prime is 91109667029. The next prime is 91109667073. The reversal of 91109667071 is 17076690119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91109667071 - 2²² = 91105472767 is a prime.

Together with 91109667073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91109667073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45554833535 + 45554833536.

It is an arithmetic number, because the mean of its divisors is an integer number (45554833536).

Almost surely, 2^91109667071 is an apocalyptic number.

91109667071 is a deficient number, since it is larger than the sum of its proper divisors (1).

91109667071 is an equidigital number, since it uses as much as digits as its factorization.

91109667071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 47.

The spelling of 91109667071 in words is "ninety-one billion, one hundred nine million, six hundred sixty-seven thousand, seventy-one".