549725881 has 4 divisors (see below), whose sum is σ = 550063332. Its totient is φ = 549388432.

The previous prime is 549725873. The next prime is 549725887. The reversal of 549725881 is 188527945.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58660281 + 491065600 = 7659^2 + 22160^2 .

It is a cyclic number.

It is not a de Polignac number, because 549725881 - 2³ = 549725873 is a prime.

It is a super-2 number, since 2×549725881² = 604397088482452322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549725887) 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, 166270 + ... + 169543.

It is an arithmetic number, because the mean of its divisors is an integer number (137515833).

Almost surely, 2^549725881 is an apocalyptic number.

It is an amenable number.

549725881 is a deficient number, since it is larger than the sum of its proper divisors (337451).

549725881 is a wasteful number, since it uses less digits than its factorization.

549725881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337450.

The product of its digits is 806400, while the sum is 49.

The square root of 549725881 is about 23446.2338340297. The cubic root of 549725881 is about 819.1851319038.

The spelling of 549725881 in words is "five hundred forty-nine million, seven hundred twenty-five thousand, eight hundred eighty-one".