5681391 has 8 divisors (see below), whose sum is σ = 7904640. Its totient is φ = 3622872.

The previous prime is 5681381. The next prime is 5681413. The reversal of 5681391 is 1931865.

5681391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5681391 - 2⁶ = 5681327 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41101 + ... + 41238.

It is an arithmetic number, because the mean of its divisors is an integer number (988080).

Almost surely, 2^5681391 is an apocalyptic number.

5681391 is the 1508-th centered pentagonal number.

5681391 is a deficient number, since it is larger than the sum of its proper divisors (2223249).

5681391 is a wasteful number, since it uses less digits than its factorization.

5681391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82365.

The product of its digits is 6480, while the sum is 33.

The square root of 5681391 is about 2383.5668650155. The cubic root of 5681391 is about 178.4369917828.

The spelling of 5681391 in words is "five million, six hundred eighty-one thousand, three hundred ninety-one".