549688681 has 6 divisors (see below), whose sum is σ = 563424446. Its totient is φ = 536280000.

The previous prime is 549688679. The next prime is 549688723. The reversal of 549688681 is 186886945.

It can be written as a sum of positive squares in 3 ways, for example, as 2128681 + 547560000 = 1459^2 + 23400^2 .

It is not a de Polignac number, because 549688681 - 2¹ = 549688679 is a prime.

It is a super-2 number, since 2×549688681² = 604315292039039522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549688631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161820 + ... + 165181.

Almost surely, 2^549688681 is an apocalyptic number.

It is an amenable number.

549688681 is a deficient number, since it is larger than the sum of its proper divisors (13735765).

549688681 is an equidigital number, since it uses as much as digits as its factorization.

549688681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327083 (or 327042 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The square root of 549688681 is about 23445.4405162283. The cubic root of 549688681 is about 819.1666533764.

The spelling of 549688681 in words is "five hundred forty-nine million, six hundred eighty-eight thousand, six hundred eighty-one".