5811181 has 4 divisors (see below), whose sum is σ = 5822172. Its totient is φ = 5800192.

The previous prime is 5811163. The next prime is 5811187. The reversal of 5811181 is 1811185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1811185 = 5 ⋅362237.

It can be written as a sum of positive squares in 2 ways, for example, as 1946025 + 3865156 = 1395^2 + 1966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5811181 is a prime.

It is a super-2 number, since 2×5811181² = 67539649229522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5811187) 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, 4660 + ... + 5773.

It is an arithmetic number, because the mean of its divisors is an integer number (1455543).

Almost surely, 2^5811181 is an apocalyptic number.

It is an amenable number.

5811181 is a deficient number, since it is larger than the sum of its proper divisors (10991).

5811181 is a wasteful number, since it uses less digits than its factorization.

5811181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10990.

The product of its digits is 320, while the sum is 25.

The square root of 5811181 is about 2410.6391268707. The cubic root of 5811181 is about 179.7855573829.

The spelling of 5811181 in words is "five million, eight hundred eleven thousand, one hundred eighty-one".