540388991 has 4 divisors (see below), whose sum is σ = 541920192. Its totient is φ = 538857792.

The previous prime is 540388967. The next prime is 540389009. The reversal of 540388991 is 199883045.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199883045 = 5 ⋅39976609.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540388991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540388951) 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, 765071 + ... + 765776.

It is an arithmetic number, because the mean of its divisors is an integer number (135480048).

Almost surely, 2^540388991 is an apocalyptic number.

540388991 is a deficient number, since it is larger than the sum of its proper divisors (1531201).

540388991 is a wasteful number, since it uses less digits than its factorization.

540388991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531200.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 540388991 is about 23246.2683241849. The cubic root of 540388991 is about 814.5207721244.

The spelling of 540388991 in words is "five hundred forty million, three hundred eighty-eight thousand, nine hundred ninety-one".