542708521 has 4 divisors (see below), whose sum is σ = 551605444. Its totient is φ = 533811600.

The previous prime is 542708479. The next prime is 542708549. The reversal of 542708521 is 125807245.

It is a happy number.

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 246490000 + 296218521 = 15700^2 + 17211^2 .

It is a cyclic number.

It is not a de Polignac number, because 542708521 - 2¹³ = 542700329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542702521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4448370 + ... + 4448491.

It is an arithmetic number, because the mean of its divisors is an integer number (137901361).

Almost surely, 2^542708521 is an apocalyptic number.

It is an amenable number.

542708521 is a deficient number, since it is larger than the sum of its proper divisors (8896923).

542708521 is an equidigital number, since it uses as much as digits as its factorization.

542708521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8896922.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 542708521 is about 23296.1052753459. The cubic root of 542708521 is about 815.6845070444.

The spelling of 542708521 in words is "five hundred forty-two million, seven hundred eight thousand, five hundred twenty-one".