5811391 has 2 divisors, whose sum is σ = 5811392. Its totient is φ = 5811390.

The previous prime is 5811389. The next prime is 5811401. The reversal of 5811391 is 1931185.

5811391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5811391 - 2¹ = 5811389 is a prime.

Together with 5811389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5811301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2905695 + 2905696.

It is an arithmetic number, because the mean of its divisors is an integer number (2905696).

Almost surely, 2^5811391 is an apocalyptic number.

5811391 is a deficient number, since it is larger than the sum of its proper divisors (1).

5811391 is an equidigital number, since it uses as much as digits as its factorization.

5811391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 5811391 is about 2410.6826833907. The cubic root of 5811391 is about 179.7877230077.

It can be divided in two parts, 58 and 11391, that added together give a square (11449 = 107²).

The spelling of 5811391 in words is "five million, eight hundred eleven thousand, three hundred ninety-one".