65591 has 4 divisors (see below), whose sum is σ = 66312. Its totient is φ = 64872.

The previous prime is 65587. The next prime is 65599. The reversal of 65591 is 19556.

65591 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 65591 - 2² = 65587 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6 and base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 65591.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65591.

It is not an unprimeable number, because it can be changed into a prime (65599) 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, 200 + ... + 413.

It is an arithmetic number, because the mean of its divisors is an integer number (16578).

2⁶⁵⁵⁹¹ is an apocalyptic number.

65591 is a deficient number, since it is larger than the sum of its proper divisors (721).

65591 is a wasteful number, since it uses less digits than its factorization.

65591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720.

The product of its digits is 1350, while the sum is 26.

The square root of 65591 is about 256.1073993464. The cubic root of 65591 is about 40.3287490331.

It can be divided in two parts, 65 and 591, that added together give a palindrome (656).

The spelling of 65591 in words is "sixty-five thousand, five hundred ninety-one".