542521 has 16 divisors (see below), whose sum is σ = 677376. Its totient is φ = 423936.

The previous prime is 542519. The next prime is 542533. The reversal of 542521 is 125245.

It is a cyclic number.

It is not a de Polignac number, because 542521 - 2¹ = 542519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542551) 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, 5545 + ... + 5641.

It is an arithmetic number, because the mean of its divisors is an integer number (42336).

2⁵⁴²⁵²¹ is an apocalyptic number.

It is an amenable number.

542521 is a deficient number, since it is larger than the sum of its proper divisors (134855).

542521 is a wasteful number, since it uses less digits than its factorization.

542521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168.

The product of its digits is 400, while the sum is 19.

The square root of 542521 is about 736.5602487238. The cubic root of 542521 is about 81.5590548938.

Adding to 542521 its reverse (125245), we get a palindrome (667766).

The spelling of 542521 in words is "five hundred forty-two thousand, five hundred twenty-one".