5091 has 4 divisors (see below), whose sum is σ = 6792. Its totient is φ = 3392.

The previous prime is 5087. The next prime is 5099. The reversal of 5091 is 1905.

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 5091 - 2² = 5087 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 5091.

It is not an unprimeable number, because it can be changed into a prime (5099) 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, 846 + ... + 851.

It is an arithmetic number, because the mean of its divisors is an integer number (1698).

2⁵⁰⁹¹ is an apocalyptic number.

5091 is a deficient number, since it is larger than the sum of its proper divisors (1701).

5091 is a wasteful number, since it uses less digits than its factorization.

5091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 5091 is about 71.3512438574. The cubic root of 5091 is about 17.2028749476.

Adding to 5091 its reverse (1905), we get a palindrome (6996).

It can be divided in two parts, 50 and 91, that added together give a palindrome (141).

The spelling of 5091 in words is "five thousand, ninety-one".