5681491 has 4 divisors (see below), whose sum is σ = 5761584. Its totient is φ = 5601400.

The previous prime is 5681471. The next prime is 5681497. The reversal of 5681491 is 1941865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941865 = 5 ⋅388373.

It is a cyclic number.

It is not a de Polignac number, because 5681491 - 2¹⁹ = 5157203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681497) 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, 39940 + ... + 40081.

It is an arithmetic number, because the mean of its divisors is an integer number (1440396).

Almost surely, 2^5681491 is an apocalyptic number.

5681491 is a deficient number, since it is larger than the sum of its proper divisors (80093).

5681491 is an equidigital number, since it uses as much as digits as its factorization.

5681491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80092.

The product of its digits is 8640, while the sum is 34.

The square root of 5681491 is about 2383.5878418888. The cubic root of 5681491 is about 178.4380386857.

The spelling of 5681491 in words is "five million, six hundred eighty-one thousand, four hundred ninety-one".