91347565 has 4 divisors (see below), whose sum is σ = 109617084. Its totient is φ = 73078048.

The previous prime is 91347551. The next prime is 91347569. The reversal of 91347565 is 56574319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56574319 = 23 ⋅2459753.

It can be written as a sum of positive squares in 2 ways, for example, as 15256836 + 76090729 = 3906^2 + 8723^2 .

It is a cyclic number.

It is not a de Polignac number, because 91347565 - 2⁵ = 91347533 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 not an unprimeable number, because it can be changed into a prime (91347569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9134752 + ... + 9134761.

It is an arithmetic number, because the mean of its divisors is an integer number (27404271).

Almost surely, 2^91347565 is an apocalyptic number.

It is an amenable number.

91347565 is a deficient number, since it is larger than the sum of its proper divisors (18269519).

91347565 is a wasteful number, since it uses less digits than its factorization.

91347565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18269518.

The product of its digits is 113400, while the sum is 40.

The square root of 91347565 is about 9557.5920084507. The cubic root of 91347565 is about 450.3660642746.

The spelling of 91347565 in words is "ninety-one million, three hundred forty-seven thousand, five hundred sixty-five".