540218691 has 12 divisors (see below), whose sum is σ = 793542360. Its totient is φ = 354041280.

The previous prime is 540218683. The next prime is 540218737. The reversal of 540218691 is 196812045.

540218691 is a `hidden beast` number, since 540 + 21 + 8 + 6 + 91 = 666.

It is not a de Polignac number, because 540218691 - 2³ = 540218683 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (540218671) 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 11 ways as a sum of consecutive naturals, for example, 508150 + ... + 509211.

It is an arithmetic number, because the mean of its divisors is an integer number (66128530).

Almost surely, 2^540218691 is an apocalyptic number.

540218691 is a deficient number, since it is larger than the sum of its proper divisors (253323669).

540218691 is a wasteful number, since it uses less digits than its factorization.

540218691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017426 (or 1017423 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 540218691 is about 23242.6050820471. The cubic root of 540218691 is about 814.4351995314.

The spelling of 540218691 in words is "five hundred forty million, two hundred eighteen thousand, six hundred ninety-one".