549115478309 has 2 divisors, whose sum is σ = 549115478310. Its totient is φ = 549115478308.

The previous prime is 549115478203. The next prime is 549115478323. The reversal of 549115478309 is 903874511945.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354854915809 + 194260562500 = 595697^2 + 440750^2 .

It is a cyclic number.

It is not a de Polignac number, because 549115478309 - 2⁸ = 549115478053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549115418309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274557739154 + 274557739155.

It is an arithmetic number, because the mean of its divisors is an integer number (274557739155).

Almost surely, 2^549115478309 is an apocalyptic number.

It is an amenable number.

549115478309 is a deficient number, since it is larger than the sum of its proper divisors (1).

549115478309 is an equidigital number, since it uses as much as digits as its factorization.

549115478309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 549115478309 in words is "five hundred forty-nine billion, one hundred fifteen million, four hundred seventy-eight thousand, three hundred nine".