540455621 has 4 divisors (see below), whose sum is σ = 548067744. Its totient is φ = 532843500.

The previous prime is 540455603. The next prime is 540455639. The reversal of 540455621 is 126554045.

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 an interprime number because it is at equal distance from previous prime (540455603) and next prime (540455639).

It is a cyclic number.

It is not a de Polignac number, because 540455621 - 2²² = 536261317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540455651) 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, 3805955 + ... + 3806096.

It is an arithmetic number, because the mean of its divisors is an integer number (137016936).

Almost surely, 2^540455621 is an apocalyptic number.

It is an amenable number.

540455621 is a deficient number, since it is larger than the sum of its proper divisors (7612123).

540455621 is an equidigital number, since it uses as much as digits as its factorization.

540455621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7612122.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 540455621 is about 23247.7014132580. The cubic root of 540455621 is about 814.5542475711.

The spelling of 540455621 in words is "five hundred forty million, four hundred fifty-five thousand, six hundred twenty-one".