549347681 has 2 divisors, whose sum is σ = 549347682. Its totient is φ = 549347680.

The previous prime is 549347671. The next prime is 549347713. The reversal of 549347681 is 186743945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472627600 + 76720081 = 21740^2 + 8759^2 .

It is a cyclic number.

It is not a de Polignac number, because 549347681 - 2¹⁰ = 549346657 is a prime.

It is a super-2 number, since 2×549347681² = 603565749240155522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (549347671) 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 as a sum of consecutive naturals, namely, 274673840 + 274673841.

It is an arithmetic number, because the mean of its divisors is an integer number (274673841).

Almost surely, 2^549347681 is an apocalyptic number.

It is an amenable number.

549347681 is a deficient number, since it is larger than the sum of its proper divisors (1).

549347681 is an equidigital number, since it uses as much as digits as its factorization.

549347681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 549347681 is about 23438.1671851704. The cubic root of 549347681 is about 818.9972280147.

The spelling of 549347681 in words is "five hundred forty-nine million, three hundred forty-seven thousand, six hundred eighty-one".