91806697 has 2 divisors, whose sum is σ = 91806698. Its totient is φ = 91806696.

The previous prime is 91806679. The next prime is 91806703. The reversal of 91806697 is 79660819.

Together with previous prime (91806679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 26050816 = 8109^2 + 5104^2 .

It is a cyclic number.

It is not a de Polignac number, because 91806697 - 2¹⁹ = 91282409 is a prime.

It is a super-3 number, since 3×91806697³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (91806607) 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, 45903348 + 45903349.

It is an arithmetic number, because the mean of its divisors is an integer number (45903349).

Almost surely, 2^91806697 is an apocalyptic number.

It is an amenable number.

91806697 is a deficient number, since it is larger than the sum of its proper divisors (1).

91806697 is an equidigital number, since it uses as much as digits as its factorization.

91806697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 91806697 is about 9581.5811325689. The cubic root of 91806697 is about 451.1193483580.

The spelling of 91806697 in words is "ninety-one million, eight hundred six thousand, six hundred ninety-seven".