540045551 has 4 divisors (see below), whose sum is σ = 540672192. Its totient is φ = 539418912.

The previous prime is 540045521. The next prime is 540045577. The reversal of 540045551 is 155540045.

It is a happy number.

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 540045551 - 2⁶ = 540045487 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 (540045521) 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 in 3 ways as a sum of consecutive naturals, for example, 312026 + ... + 313751.

It is an arithmetic number, because the mean of its divisors is an integer number (135168048).

Almost surely, 2^540045551 is an apocalyptic number.

540045551 is a deficient number, since it is larger than the sum of its proper divisors (626641).

540045551 is an equidigital number, since it uses as much as digits as its factorization.

540045551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626640.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 540045551 is about 23238.8801580455. The cubic root of 540045551 is about 814.3481814526.

Adding to 540045551 its reverse (155540045), we get a palindrome (695585596).

The spelling of 540045551 in words is "five hundred forty million, forty-five thousand, five hundred fifty-one".