549686521 has 2 divisors, whose sum is σ = 549686522. Its totient is φ = 549686520.

The previous prime is 549686497. The next prime is 549686563. The reversal of 549686521 is 125686945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549668025 + 18496 = 23445^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 549686521 - 2¹⁹ = 549162233 is a prime.

It is not a weakly prime, because it can be changed into another prime (549689521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274843260 + 274843261.

It is an arithmetic number, because the mean of its divisors is an integer number (274843261).

Almost surely, 2^549686521 is an apocalyptic number.

It is an amenable number.

549686521 is a deficient number, since it is larger than the sum of its proper divisors (1).

549686521 is an equidigital number, since it uses as much as digits as its factorization.

549686521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The square root of 549686521 is about 23445.3944517895. The cubic root of 549686521 is about 819.1655804041.

The spelling of 549686521 in words is "five hundred forty-nine million, six hundred eighty-six thousand, five hundred twenty-one".