549331326391 has 2 divisors, whose sum is σ = 549331326392. Its totient is φ = 549331326390.

The previous prime is 549331326343. The next prime is 549331326419. The reversal of 549331326391 is 193623133945.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 549331326391 - 2¹¹ = 549331324343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549331326331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274665663195 + 274665663196.

It is an arithmetic number, because the mean of its divisors is an integer number (274665663196).

Almost surely, 2^549331326391 is an apocalyptic number.

549331326391 is a deficient number, since it is larger than the sum of its proper divisors (1).

549331326391 is an equidigital number, since it uses as much as digits as its factorization.

549331326391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 49.

The spelling of 549331326391 in words is "five hundred forty-nine billion, three hundred thirty-one million, three hundred twenty-six thousand, three hundred ninety-one".