540642643 has 2 divisors, whose sum is σ = 540642644. Its totient is φ = 540642642.

The previous prime is 540642637. The next prime is 540642671. The reversal of 540642643 is 346246045.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540642643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 540642599 and 540642608.

It is not a weakly prime, because it can be changed into another prime (540642673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270321321 + 270321322.

It is an arithmetic number, because the mean of its divisors is an integer number (270321322).

Almost surely, 2^540642643 is an apocalyptic number.

540642643 is a deficient number, since it is larger than the sum of its proper divisors (1).

540642643 is an equidigital number, since it uses as much as digits as its factorization.

540642643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 540642643 is about 23251.7234415000. The cubic root of 540642643 is about 814.6481942276.

Adding to 540642643 its reverse (346246045), we get a palindrome (886888688).

The spelling of 540642643 in words is "five hundred forty million, six hundred forty-two thousand, six hundred forty-three".