549561881 has 8 divisors (see below), whose sum is σ = 599940000. Its totient is φ = 499253440.

The previous prime is 549561877. The next prime is 549561923. The reversal of 549561881 is 188165945.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 549561881 - 2² = 549561877 is a prime.

It is a super-2 number, since 2×549561881² = 604036522096516322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (549561811) 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 7 ways as a sum of consecutive naturals, for example, 176 + ... + 33153.

It is an arithmetic number, because the mean of its divisors is an integer number (74992500).

Almost surely, 2^549561881 is an apocalyptic number.

It is an amenable number.

549561881 is a deficient number, since it is larger than the sum of its proper divisors (50378119).

549561881 is a wasteful number, since it uses less digits than its factorization.

549561881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34839.

The product of its digits is 345600, while the sum is 47.

The square root of 549561881 is about 23442.7362097516. The cubic root of 549561881 is about 819.1036611634.

It can be divided in two parts, 5495 and 61881, that added together give a palindrome (67376).

The spelling of 549561881 in words is "five hundred forty-nine million, five hundred sixty-one thousand, eight hundred eighty-one".