542609 has 4 divisors (see below), whose sum is σ = 550116. Its totient is φ = 535104.

The previous prime is 542603. The next prime is 542683. The reversal of 542609 is 906245.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148225 + 394384 = 385^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 542609 - 2¹² = 538513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542603) 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, 3644 + ... + 3789.

It is an arithmetic number, because the mean of its divisors is an integer number (137529).

2⁵⁴²⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

542609 is a deficient number, since it is larger than the sum of its proper divisors (7507).

542609 is an equidigital number, since it uses as much as digits as its factorization.

542609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 542609 is about 736.6199834379. The cubic root of 542609 is about 81.5634644367.

It can be divided in two parts, 542 and 609, that multiplied together give a triangular number (330078 = T₈₁₂).

The spelling of 542609 in words is "five hundred forty-two thousand, six hundred nine".