542316809 has 4 divisors (see below), whose sum is σ = 543202116. Its totient is φ = 541431504.

The previous prime is 542316763. The next prime is 542316823. The reversal of 542316809 is 908613245.

It is a happy number.

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 239382784 + 302934025 = 15472^2 + 17405^2 .

It is a cyclic number.

It is not a de Polignac number, because 542316809 - 2¹⁶ = 542251273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542316889) 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, 441734 + ... + 442959.

It is an arithmetic number, because the mean of its divisors is an integer number (135800529).

Almost surely, 2^542316809 is an apocalyptic number.

It is an amenable number.

542316809 is a deficient number, since it is larger than the sum of its proper divisors (885307).

542316809 is an equidigital number, since it uses as much as digits as its factorization.

542316809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885306.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 542316809 is about 23287.6965155423. The cubic root of 542316809 is about 815.4882136383.

The spelling of 542316809 in words is "five hundred forty-two million, three hundred sixteen thousand, eight hundred nine".