549778879 has 4 divisors (see below), whose sum is σ = 592069576. Its totient is φ = 507488184.

The previous prime is 549778847. The next prime is 549778903. The reversal of 549778879 is 978877945.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978877945 = 5 ⋅195775589.

It is a cyclic number.

It is not a de Polignac number, because 549778879 - 2⁵ = 549778847 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 549778879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549778279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21145329 + ... + 21145354.

It is an arithmetic number, because the mean of its divisors is an integer number (148017394).

Almost surely, 2^549778879 is an apocalyptic number.

549778879 is a deficient number, since it is larger than the sum of its proper divisors (42290697).

549778879 is a wasteful number, since it uses less digits than its factorization.

549778879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42290696.

The product of its digits is 35562240, while the sum is 64.

The square root of 549778879 is about 23447.3640096280. The cubic root of 549778879 is about 819.2114564048.

The spelling of 549778879 in words is "five hundred forty-nine million, seven hundred seventy-eight thousand, eight hundred seventy-nine".