540622721 has 4 divisors (see below), whose sum is σ = 544749744. Its totient is φ = 536495700.

The previous prime is 540622697. The next prime is 540622769. The reversal of 540622721 is 127226045.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 540622721 - 2⁶ = 540622657 is a prime.

It is a super-2 number, since 2×540622721² = 584545852922887682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (540622421) 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, 2063315 + ... + 2063576.

It is an arithmetic number, because the mean of its divisors is an integer number (136187436).

Almost surely, 2^540622721 is an apocalyptic number.

It is an amenable number.

540622721 is a deficient number, since it is larger than the sum of its proper divisors (4127023).

540622721 is a wasteful number, since it uses less digits than its factorization.

540622721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4127022.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 540622721 is about 23251.2950392016. The cubic root of 540622721 is about 814.6381878516.

Adding to 540622721 its reverse (127226045), we get a palindrome (667848766).

The spelling of 540622721 in words is "five hundred forty million, six hundred twenty-two thousand, seven hundred twenty-one".