57491 has 8 divisors (see below), whose sum is σ = 67584. Its totient is φ = 47880.

The previous prime is 57487. The next prime is 57493. The reversal of 57491 is 19475.

57491 is nontrivially palindromic in base 9.

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

It is not a de Polignac number, because 57491 - 2² = 57487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206 + ... + 396.

It is an arithmetic number, because the mean of its divisors is an integer number (8448).

2⁵⁷⁴⁹¹ is an apocalyptic number.

57491 is a deficient number, since it is larger than the sum of its proper divisors (10093).

57491 is a wasteful number, since it uses less digits than its factorization.

57491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its digits is 1260, while the sum is 26.

The square root of 57491 is about 239.7728091340. The cubic root of 57491 is about 38.5951992741.

The spelling of 57491 in words is "fifty-seven thousand, four hundred ninety-one".