542531 has 16 divisors (see below), whose sum is σ = 642048. Its totient is φ = 453600.

The previous prime is 542519. The next prime is 542533. The reversal of 542531 is 135245.

It is a cyclic number.

It is not a de Polignac number, because 542531 - 2⁶ = 542467 is a prime.

It is a super-2 number, since 2×542531² = 588679771922, which contains 22 as substring.

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 542531.

It is not an unprimeable number, because it can be changed into a prime (542533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12596 + ... + 12638.

It is an arithmetic number, because the mean of its divisors is an integer number (40128).

2⁵⁴²⁵³¹ is an apocalyptic number.

542531 is a deficient number, since it is larger than the sum of its proper divisors (99517).

542531 is a wasteful number, since it uses less digits than its factorization.

542531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122.

The product of its digits is 600, while the sum is 20.

The square root of 542531 is about 736.5670370034. The cubic root of 542531 is about 81.5595560022.

Adding to 542531 its reverse (135245), we get a palindrome (677776).

The spelling of 542531 in words is "five hundred forty-two thousand, five hundred thirty-one".