542879521 has 4 divisors (see below), whose sum is σ = 543084100. Its totient is φ = 542674944.

The previous prime is 542879501. The next prime is 542879527. The reversal of 542879521 is 125978245.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178489600 + 364389921 = 13360^2 + 19089^2 .

It is a cyclic number.

It is not a de Polignac number, because 542879521 - 2⁵ = 542879489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542879527) 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, 98256 + ... + 103633.

It is an arithmetic number, because the mean of its divisors is an integer number (135771025).

Almost surely, 2^542879521 is an apocalyptic number.

It is an amenable number.

542879521 is a deficient number, since it is larger than the sum of its proper divisors (204579).

542879521 is a wasteful number, since it uses less digits than its factorization.

542879521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204578.

The product of its digits is 201600, while the sum is 43.

The square root of 542879521 is about 23299.7751276702. The cubic root of 542879521 is about 815.7701683760.

The spelling of 542879521 in words is "five hundred forty-two million, eight hundred seventy-nine thousand, five hundred twenty-one".