550859809 has 4 divisors (see below), whose sum is σ = 551053504. Its totient is φ = 550666116.

The previous prime is 550859779. The next prime is 550859839. The reversal of 550859809 is 908958055.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 908958055 = 5 ⋅181791611.

It is an interprime number because it is at equal distance from previous prime (550859779) and next prime (550859839).

It is a cyclic number.

It is not a de Polignac number, because 550859809 - 2⁷ = 550859681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550859839) 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, 92517 + ... + 98290.

It is an arithmetic number, because the mean of its divisors is an integer number (137763376).

Almost surely, 2^550859809 is an apocalyptic number.

It is an amenable number.

550859809 is a deficient number, since it is larger than the sum of its proper divisors (193695).

550859809 is a wasteful number, since it uses less digits than its factorization.

550859809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193694.

The product of its (nonzero) digits is 648000, while the sum is 49.

The square root of 550859809 is about 23470.4028299473. The cubic root of 550859809 is about 819.7479936488.

The spelling of 550859809 in words is "five hundred fifty million, eight hundred fifty-nine thousand, eight hundred nine".