548449561 has 9 divisors (see below), whose sum is σ = 603124543. Its totient is φ = 498356320.

The previous prime is 548449553. The next prime is 548449567. The reversal of 548449561 is 165944845.

It is a happy number.

The square root of 548449561 is 23419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 138791961 + 409657600 = 11781^2 + 20240^2 .

It is not a de Polignac number, because 548449561 - 2³ = 548449553 is a prime.

It is a super-2 number, since 2×548449561² = 601593841922185442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (548449567) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 256545 + ... + 258673.

Almost surely, 2^548449561 is an apocalyptic number.

548449561 is the 23419-th square number.

548449561 is the 11710-th centered octagonal number.

It is an amenable number.

548449561 is a deficient number, since it is larger than the sum of its proper divisors (54674982).

548449561 is an frugal number, since it uses more digits than its factorization.

548449561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280 (or 2140 counting only the distinct ones).

The product of its digits is 691200, while the sum is 46.

The cubic root of 548449561 is about 818.5506626118.

The spelling of 548449561 in words is "five hundred forty-eight million, four hundred forty-nine thousand, five hundred sixty-one".