542581 has 4 divisors (see below), whose sum is σ = 584332. Its totient is φ = 500832.

The previous prime is 542579. The next prime is 542587. The reversal of 542581 is 185245.

542581 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 an emirpimes, since its reverse is a distinct semiprime: 185245 = 5 ⋅37049.

It can be written as a sum of positive squares in 2 ways, for example, as 348100 + 194481 = 590^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 542581 - 2¹ = 542579 is a prime.

It is a super-2 number, since 2×542581² = 588788283122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542587) 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, 20856 + ... + 20881.

It is an arithmetic number, because the mean of its divisors is an integer number (146083).

2⁵⁴²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

542581 is a deficient number, since it is larger than the sum of its proper divisors (41751).

542581 is a wasteful number, since it uses less digits than its factorization.

542581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41750.

The product of its digits is 1600, while the sum is 25.

The square root of 542581 is about 736.6009774634. The cubic root of 542581 is about 81.5620614520.

The spelling of 542581 in words is "five hundred forty-two thousand, five hundred eighty-one".