• 542 can be written using four 4's:
542 has 4 divisors (see below), whose sum is σ = 816. Its totient is φ = 270.
The previous prime is 541. The next prime is 547. The reversal of 542 is 245.
542 is nontrivially palindromic in base 15.
542 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.
542 is an undulating number in base 15.
It is a plaindrome in base 14.
It is a nialpdrome in base 9 and base 10.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 542.
It is not an unprimeable number, because it can be changed into a prime (541) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134 + ... + 137.
It is an arithmetic number, because the mean of its divisors is an integer number (204).
542 is a deficient number, since it is larger than the sum of its proper divisors (274).
542 is a wasteful number, since it uses less digits than its factorization.
542 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 273.
The product of its digits is 40, while the sum is 11.
The square root of 542 is about 23.2808934536. The cubic root of 542 is about 8.1532938622.
Adding to 542 its reverse (245), we get a palindrome (787).
It can be divided in two parts, 5 and 42, that multiplied together give a triangular number (210 = T20).
The spelling of 542 in words is "five hundred forty-two", and thus it is an aban number.
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