91234565 has 4 divisors (see below), whose sum is σ = 109481484. Its totient is φ = 72987648.

The previous prime is 91234547. The next prime is 91234603. The reversal of 91234565 is 56543219.

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 28238596 + 62995969 = 5314^2 + 7937^2 .

It is a cyclic number.

It is not a de Polignac number, because 91234565 - 2¹⁸ = 90972421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9123452 + ... + 9123461.

It is an arithmetic number, because the mean of its divisors is an integer number (27370371).

Almost surely, 2^91234565 is an apocalyptic number.

It is an amenable number.

91234565 is a deficient number, since it is larger than the sum of its proper divisors (18246919).

91234565 is a wasteful number, since it uses less digits than its factorization.

91234565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18246918.

The product of its digits is 32400, while the sum is 35.

The square root of 91234565 is about 9551.6786482796. The cubic root of 91234565 is about 450.1802816743.

The spelling of 91234565 in words is "ninety-one million, two hundred thirty-four thousand, five hundred sixty-five".