549128641 has 4 divisors (see below), whose sum is σ = 549177300. Its totient is φ = 549079984.

The previous prime is 549128627. The next prime is 549128647. The reversal of 549128641 is 146821945.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 293128641 + 256000000 = 17121^2 + 16000^2 .

It is a cyclic number.

It is not a de Polignac number, because 549128641 - 2²³ = 540740033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 549128594 and 549128603.

It is not an unprimeable number, because it can be changed into a prime (549128647) 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, 2355 + ... + 33223.

It is an arithmetic number, because the mean of its divisors is an integer number (137294325).

Almost surely, 2^549128641 is an apocalyptic number.

It is an amenable number.

549128641 is a deficient number, since it is larger than the sum of its proper divisors (48659).

549128641 is a wasteful number, since it uses less digits than its factorization.

549128641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48658.

The product of its digits is 69120, while the sum is 40.

The square root of 549128641 is about 23433.4939989751. The cubic root of 549128641 is about 818.8883613186. Note that the first 3 decimals are identical.

The spelling of 549128641 in words is "five hundred forty-nine million, one hundred twenty-eight thousand, six hundred forty-one".