91327765 has 4 divisors (see below), whose sum is σ = 109593324. Its totient is φ = 73062208.

The previous prime is 91327751. The next prime is 91327783. The reversal of 91327765 is 56772319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69105969 + 22221796 = 8313^2 + 4714^2 .

It is a cyclic number.

It is not a de Polignac number, because 91327765 - 2⁹ = 91327253 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 9132772 + ... + 9132781.

It is an arithmetic number, because the mean of its divisors is an integer number (27398331).

Almost surely, 2^91327765 is an apocalyptic number.

It is an amenable number.

91327765 is a deficient number, since it is larger than the sum of its proper divisors (18265559).

91327765 is a wasteful number, since it uses less digits than its factorization.

91327765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18265558.

The product of its digits is 79380, while the sum is 40.

The square root of 91327765 is about 9556.5561265552. The cubic root of 91327765 is about 450.3335222927. Note that the first 3 decimals are identical.

The spelling of 91327765 in words is "ninety-one million, three hundred twenty-seven thousand, seven hundred sixty-five".