68591 has 4 divisors (see below), whose sum is σ = 69312. Its totient is φ = 67872.

The previous prime is 68581. The next prime is 68597. The reversal of 68591 is 19586.

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 68591 - 2¹⁰ = 67567 is a prime.

It is a Duffinian number.

Its product of digits (2160) is a multiple of the sum of its prime divisors (720).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191 + ... + 416.

It is an arithmetic number, because the mean of its divisors is an integer number (17328).

2⁶⁸⁵⁹¹ is an apocalyptic number.

68591 is a deficient number, since it is larger than the sum of its proper divisors (721).

68591 is a wasteful number, since it uses less digits than its factorization.

68591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720.

The product of its digits is 2160, while the sum is 29.

The square root of 68591 is about 261.8988354308. The cubic root of 68591 is about 40.9344580417.

The spelling of 68591 in words is "sixty-eight thousand, five hundred ninety-one".