91000090067 has 2 divisors, whose sum is σ = 91000090068. Its totient is φ = 91000090066.

The previous prime is 91000090021. The next prime is 91000090099. The reversal of 91000090067 is 76009000019.

It is an a-pointer prime, because the next prime (91000090099) can be obtained adding 91000090067 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91000090067 - 2²⁴ = 90983312851 is a prime.

It is a super-2 number, since 2×91000090067² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91000090967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500045033 + 45500045034.

It is an arithmetic number, because the mean of its divisors is an integer number (45500045034).

Almost surely, 2^91000090067 is an apocalyptic number.

91000090067 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000090067 is an equidigital number, since it uses as much as digits as its factorization.

91000090067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The spelling of 91000090067 in words is "ninety-one billion, ninety thousand, sixty-seven".