91563365 has 4 divisors (see below), whose sum is σ = 109876044. Its totient is φ = 73250688.

The previous prime is 91563361. The next prime is 91563397. The reversal of 91563365 is 56336519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56336519 = 229 ⋅246011.

It can be written as a sum of positive squares in 2 ways, for example, as 61434244 + 30129121 = 7838^2 + 5489^2 .

It is a cyclic number.

It is not a de Polignac number, because 91563365 - 2² = 91563361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91563361) 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, 9156332 + ... + 9156341.

It is an arithmetic number, because the mean of its divisors is an integer number (27469011).

Almost surely, 2^91563365 is an apocalyptic number.

It is an amenable number.

91563365 is a deficient number, since it is larger than the sum of its proper divisors (18312679).

91563365 is a wasteful number, since it uses less digits than its factorization.

91563365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18312678.

The product of its digits is 72900, while the sum is 38.

The square root of 91563365 is about 9568.8748032357. The cubic root of 91563365 is about 450.7204344711.

It can be divided in two parts, 9156 and 3365, that added together give a palindrome (12521).

The spelling of 91563365 in words is "ninety-one million, five hundred sixty-three thousand, three hundred sixty-five".