542235209 has 8 divisors (see below), whose sum is σ = 565943112. Its totient is φ = 519026560.

The previous prime is 542235191. The next prime is 542235227. The reversal of 542235209 is 902532245.

It is an interprime number because it is at equal distance from previous prime (542235191) and next prime (542235227).

It can be written as a sum of positive squares in 4 ways, for example, as 6775609 + 535459600 = 2603^2 + 23140^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 542235209 - 2¹⁶ = 542169673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (542235409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122594 + ... + 126939.

It is an arithmetic number, because the mean of its divisors is an integer number (70742889).

Almost surely, 2^542235209 is an apocalyptic number.

It is an amenable number.

542235209 is a deficient number, since it is larger than the sum of its proper divisors (23707903).

542235209 is a wasteful number, since it uses less digits than its factorization.

542235209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249627.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 542235209 is about 23285.9444515356. The cubic root of 542235209 is about 815.4473106243.

The spelling of 542235209 in words is "five hundred forty-two million, two hundred thirty-five thousand, two hundred nine".