549825209 has 4 divisors (see below), whose sum is σ = 554022480. Its totient is φ = 545627940.

The previous prime is 549825167. The next prime is 549825247. The reversal of 549825209 is 902528945.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 549825209 - 2¹² = 549821113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 549825209.

It is not an unprimeable number, because it can be changed into a prime (549815209) 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, 2098439 + ... + 2098700.

It is an arithmetic number, because the mean of its divisors is an integer number (138505620).

Almost surely, 2^549825209 is an apocalyptic number.

It is an amenable number.

549825209 is a deficient number, since it is larger than the sum of its proper divisors (4197271).

549825209 is a wasteful number, since it uses less digits than its factorization.

549825209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197270.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 549825209 is about 23448.3519463522. The cubic root of 549825209 is about 819.2344674748.

The spelling of 549825209 in words is "five hundred forty-nine million, eight hundred twenty-five thousand, two hundred nine".