91000092091 has 2 divisors, whose sum is σ = 91000092092. Its totient is φ = 91000092090.

The previous prime is 91000092059. The next prime is 91000092103. The reversal of 91000092091 is 19029000019.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91000092091 - 2⁵ = 91000092059 is a prime.

It is not a weakly prime, because it can be changed into another prime (91000092041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500046045 + 45500046046.

It is an arithmetic number, because the mean of its divisors is an integer number (45500046046).

Almost surely, 2^91000092091 is an apocalyptic number.

91000092091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000092091 is an equidigital number, since it uses as much as digits as its factorization.

91000092091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The spelling of 91000092091 in words is "ninety-one billion, ninety-two thousand, ninety-one".