540501391 has 4 divisors (see below), whose sum is σ = 559139400. Its totient is φ = 521863384.

The previous prime is 540501389. The next prime is 540501397. The reversal of 540501391 is 193105045.

540501391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 540501391 - 2¹ = 540501389 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 (540501397) 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, 9318961 + ... + 9319018.

It is an arithmetic number, because the mean of its divisors is an integer number (139784850).

Almost surely, 2^540501391 is an apocalyptic number.

540501391 is a deficient number, since it is larger than the sum of its proper divisors (18638009).

540501391 is a wasteful number, since it uses less digits than its factorization.

540501391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18638008.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 540501391 is about 23248.6857908141. The cubic root of 540501391 is about 814.5772411923.

The spelling of 540501391 in words is "five hundred forty million, five hundred one thousand, three hundred ninety-one".