542750209 has 3 divisors (see below), whose sum is σ = 542773507. Its totient is φ = 542726912.

The previous prime is 542750191. The next prime is 542750237. The reversal of 542750209 is 902057245.

The square root of 542750209 is 23297.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 902057245 = 5 ⋅180411449.

It can be written as a sum of positive squares in only one way, i.e., 55577025 + 487173184 = 7455^2 + 22072^2 .

It is not a de Polignac number, because 542750209 - 2⁷ = 542750081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542750009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11649 + ... + 34945.

Almost surely, 2^542750209 is an apocalyptic number.

542750209 is the 23297-th square number.

542750209 is the 11649-th centered octagonal number.

It is an amenable number.

542750209 is a deficient number, since it is larger than the sum of its proper divisors (23298).

542750209 is an frugal number, since it uses more digits than its factorization.

542750209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46594 (or 23297 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The cubic root of 542750209 is about 815.7053920338.

The spelling of 542750209 in words is "five hundred forty-two million, seven hundred fifty thousand, two hundred nine".