5811861 has 16 divisors (see below), whose sum is σ = 8746560. Its totient is φ = 3400320.

The previous prime is 5811833. The next prime is 5811863. The reversal of 5811861 is 1681185.

It is a happy number.

It is not a de Polignac number, because 5811861 - 2⁵ = 5811829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5811863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080 + ... + 3993.

It is an arithmetic number, because the mean of its divisors is an integer number (546660).

Almost surely, 2^5811861 is an apocalyptic number.

It is an amenable number.

5811861 is a deficient number, since it is larger than the sum of its proper divisors (2934699).

5811861 is a wasteful number, since it uses less digits than its factorization.

5811861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116.

The product of its digits is 1920, while the sum is 30.

The square root of 5811861 is about 2410.7801641792. The cubic root of 5811861 is about 179.7925696931.

It can be divided in two parts, 581 and 1861, that added together give a palindrome (2442).

The spelling of 5811861 in words is "five million, eight hundred eleven thousand, eight hundred sixty-one".