542321 has 6 divisors (see below), whose sum is σ = 587430. Its totient is φ = 500448.

The previous prime is 542299. The next prime is 542323. The reversal of 542321 is 123245.

It can be written as a sum of positive squares in 3 ways, for example, as 625 + 541696 = 25^2 + 736^2 .

It is not a de Polignac number, because 542321 - 2¹⁴ = 525937 is a prime.

It is a super-2 number, since 2×542321² = 588224134082, 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 542321.

It is not an unprimeable number, because it can be changed into a prime (542323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1436 + ... + 1773.

It is an arithmetic number, because the mean of its divisors is an integer number (97905).

2⁵⁴²³²¹ is an apocalyptic number.

It is an amenable number.

542321 is a deficient number, since it is larger than the sum of its proper divisors (45109).

542321 is a wasteful number, since it uses less digits than its factorization.

542321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235 (or 3222 counting only the distinct ones).

The product of its digits is 240, while the sum is 17.

The square root of 542321 is about 736.4244699900. The cubic root of 542321 is about 81.5490314318.

Adding to 542321 its reverse (123245), we get a palindrome (665566).

The spelling of 542321 in words is "five hundred forty-two thousand, three hundred twenty-one".