542566521 has 12 divisors (see below), whose sum is σ = 895665472. Its totient is φ = 310037976.

The previous prime is 542566487. The next prime is 542566529. The reversal of 542566521 is 125665245.

542566521 is a `hidden beast` number, since 5 + 42 + 566 + 52 + 1 = 666.

It is not a de Polignac number, because 542566521 - 2⁹ = 542566009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542566529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4306021 + ... + 4306146.

Almost surely, 2^542566521 is an apocalyptic number.

It is an amenable number.

542566521 is a deficient number, since it is larger than the sum of its proper divisors (353098951).

542566521 is a wasteful number, since it uses less digits than its factorization.

542566521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8612180 (or 8612177 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 542566521 is about 23293.0573562167. The cubic root of 542566521 is about 815.6133593970.

The spelling of 542566521 in words is "five hundred forty-two million, five hundred sixty-six thousand, five hundred twenty-one".