540491 has 4 divisors (see below), whose sum is σ = 617712. Its totient is φ = 463272.

The previous prime is 540469. The next prime is 540509. The reversal of 540491 is 194045.

It is a happy number.

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 540491 - 2¹⁸ = 278347 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 540491.

It is not an unprimeable number, because it can be changed into a prime (540461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38600 + ... + 38613.

It is an arithmetic number, because the mean of its divisors is an integer number (154428).

2⁵⁴⁰⁴⁹¹ is an apocalyptic number.

540491 is a deficient number, since it is larger than the sum of its proper divisors (77221).

540491 is an equidigital number, since it uses as much as digits as its factorization.

540491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77220.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 540491 is about 735.1809301118. The cubic root of 540491 is about 81.4572021146.

The spelling of 540491 in words is "five hundred forty thousand, four hundred ninety-one".