542668009 has 4 divisors (see below), whose sum is σ = 584411716. Its totient is φ = 500924304.

The previous prime is 542667973. The next prime is 542668013. The reversal of 542668009 is 900866245.

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 29192409 + 513475600 = 5403^2 + 22660^2 .

It is a cyclic number.

It is not a de Polignac number, because 542668009 - 2²³ = 534279401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542668019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20871834 + ... + 20871859.

It is an arithmetic number, because the mean of its divisors is an integer number (146102929).

Almost surely, 2^542668009 is an apocalyptic number.

It is an amenable number.

542668009 is a deficient number, since it is larger than the sum of its proper divisors (41743707).

542668009 is a wasteful number, since it uses less digits than its factorization.

542668009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41743706.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 542668009 is about 23295.2357575535. The cubic root of 542668009 is about 815.6642101866.

The spelling of 542668009 in words is "five hundred forty-two million, six hundred sixty-eight thousand, nine".