542681 has 4 divisors (see below), whose sum is σ = 544164. Its totient is φ = 541200.

The previous prime is 542603. The next prime is 542683. The reversal of 542681 is 186245.

542681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 292681 + 250000 = 541^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 542681 - 2¹⁰ = 541657 is a prime.

It is a super-2 number, since 2×542681² = 589005335522, which contains 22 as substring.

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 542681.

It is not an unprimeable number, because it can be changed into a prime (542683) 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, 251 + ... + 1071.

It is an arithmetic number, because the mean of its divisors is an integer number (136041).

2⁵⁴²⁶⁸¹ is an apocalyptic number.

It is an amenable number.

542681 is a deficient number, since it is larger than the sum of its proper divisors (1483).

542681 is an equidigital number, since it uses as much as digits as its factorization.

542681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482.

The product of its digits is 1920, while the sum is 26.

The square root of 542681 is about 736.6688536921. The cubic root of 542681 is about 81.5670718899.

The spelling of 542681 in words is "five hundred forty-two thousand, six hundred eighty-one".