591891 has 4 divisors (see below), whose sum is σ = 789192. Its totient is φ = 394592.

The previous prime is 591887. The next prime is 591893. The reversal of 591891 is 198195.

591891 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 591891 - 2² = 591887 is a prime.

It is a D-number.

591891 is strictly pandigital in base 7.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 591891.

It is not an unprimeable number, because it can be changed into a prime (591893) 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, 98646 + ... + 98651.

It is an arithmetic number, because the mean of its divisors is an integer number (197298).

2⁵⁹¹⁸⁹¹ is an apocalyptic number.

591891 is a deficient number, since it is larger than the sum of its proper divisors (197301).

591891 is a wasteful number, since it uses less digits than its factorization.

591891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197300.

The product of its digits is 3240, while the sum is 33.

The square root of 591891 is about 769.3445262040. The cubic root of 591891 is about 83.9615753964.

The spelling of 591891 in words is "five hundred ninety-one thousand, eight hundred ninety-one".