91040006689 has 2 divisors, whose sum is σ = 91040006690. Its totient is φ = 91040006688.

The previous prime is 91040006683. The next prime is 91040006731. The reversal of 91040006689 is 98660004019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60339009600 + 30700997089 = 245640^2 + 175217^2 .

It is a cyclic number.

It is not a de Polignac number, because 91040006689 - 2²³ = 91031618081 is a prime.

It is not a weakly prime, because it can be changed into another prime (91040006683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45520003344 + 45520003345.

It is an arithmetic number, because the mean of its divisors is an integer number (45520003345).

Almost surely, 2^91040006689 is an apocalyptic number.

It is an amenable number.

91040006689 is a deficient number, since it is larger than the sum of its proper divisors (1).

91040006689 is an equidigital number, since it uses as much as digits as its factorization.

91040006689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 91040006689 in words is "ninety-one billion, forty million, six thousand, six hundred eighty-nine".