540540991 has 4 divisors (see below), whose sum is σ = 545892984. Its totient is φ = 535189000.

The previous prime is 540540967. The next prime is 540541019. The reversal of 540540991 is 199045045.

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 540540991 - 2⁷ = 540540863 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 540540991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540540901) 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, 2675845 + ... + 2676046.

It is an arithmetic number, because the mean of its divisors is an integer number (136473246).

Almost surely, 2^540540991 is an apocalyptic number.

540540991 is a deficient number, since it is larger than the sum of its proper divisors (5351993).

540540991 is a wasteful number, since it uses less digits than its factorization.

540540991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351992.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 540540991 is about 23249.5374362588. The cubic root of 540540991 is about 814.5971341236.

The spelling of 540540991 in words is "five hundred forty million, five hundred forty thousand, nine hundred ninety-one".