540909491 has 4 divisors (see below), whose sum is σ = 541372584. Its totient is φ = 540446400.

The previous prime is 540909449. The next prime is 540909521. The reversal of 540909491 is 194909045.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194909045 = 5 ⋅38981809.

It is a cyclic number.

It is not a de Polignac number, because 540909491 - 2²² = 536715187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540909991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229790 + ... + 232131.

It is an arithmetic number, because the mean of its divisors is an integer number (135343146).

Almost surely, 2^540909491 is an apocalyptic number.

540909491 is a deficient number, since it is larger than the sum of its proper divisors (463093).

540909491 is a wasteful number, since it uses less digits than its factorization.

540909491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463092.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 540909491 is about 23257.4609749216. The cubic root of 540909491 is about 814.7822023309.

The spelling of 540909491 in words is "five hundred forty million, nine hundred nine thousand, four hundred ninety-one".