550189309 has 4 divisors (see below), whose sum is σ = 582553404. Its totient is φ = 517825216.

The previous prime is 550189303. The next prime is 550189313. The reversal of 550189309 is 903981055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903981055 = 5 ⋅180796211.

It can be written as a sum of positive squares in 2 ways, for example, as 414000409 + 136188900 = 20347^2 + 11670^2 .

It is a cyclic number.

It is not a de Polignac number, because 550189309 - 2³ = 550189301 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550189301) 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, 16182022 + ... + 16182055.

It is an arithmetic number, because the mean of its divisors is an integer number (145638351).

Almost surely, 2^550189309 is an apocalyptic number.

It is an amenable number.

550189309 is a deficient number, since it is larger than the sum of its proper divisors (32364095).

550189309 is a wasteful number, since it uses less digits than its factorization.

550189309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32364094.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 550189309 is about 23456.1145333152. The cubic root of 550189309 is about 819.4152627814.

The spelling of 550189309 in words is "five hundred fifty million, one hundred eighty-nine thousand, three hundred nine".