56491 has 4 divisors (see below), whose sum is σ = 59832. Its totient is φ = 53152.

The previous prime is 56489. The next prime is 56501. The reversal of 56491 is 19465.

56491 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56491 - 2¹ = 56489 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56401) 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, 1645 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (14958).

2⁵⁶⁴⁹¹ is an apocalyptic number.

56491 is a deficient number, since it is larger than the sum of its proper divisors (3341).

56491 is a wasteful number, since it uses less digits than its factorization.

56491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340.

The product of its digits is 1080, while the sum is 25.

The square root of 56491 is about 237.6783540838. The cubic root of 56491 is about 38.3701138265.

The spelling of 56491 in words is "fifty-six thousand, four hundred ninety-one".