540551521 has 4 divisors (see below), whose sum is σ = 543867952. Its totient is φ = 537235092.

The previous prime is 540551513. The next prime is 540551579. The reversal of 540551521 is 125155045.

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 540551521 - 2³ = 540551513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 540551521.

It is not an unprimeable number, because it can be changed into a prime (540551321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657971 + ... + 1658296.

It is an arithmetic number, because the mean of its divisors is an integer number (135966988).

Almost surely, 2^540551521 is an apocalyptic number.

It is an amenable number.

540551521 is a deficient number, since it is larger than the sum of its proper divisors (3316431).

540551521 is a wasteful number, since it uses less digits than its factorization.

540551521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316430.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 540551521 is about 23249.7638912743. The cubic root of 540551521 is about 814.6024236713.

The spelling of 540551521 in words is "five hundred forty million, five hundred fifty-one thousand, five hundred twenty-one".