581549346949 has 2 divisors, whose sum is σ = 581549346950. Its totient is φ = 581549346948.

The previous prime is 581549346901. The next prime is 581549346977. The reversal of 581549346949 is 949643945185.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578425654849 + 3123692100 = 760543^2 + 55890^2 .

It is a cyclic number.

It is not a de Polignac number, because 581549346949 - 2¹⁹ = 581548822661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581549346149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290774673474 + 290774673475.

It is an arithmetic number, because the mean of its divisors is an integer number (290774673475).

Almost surely, 2^581549346949 is an apocalyptic number.

It is an amenable number.

581549346949 is a deficient number, since it is larger than the sum of its proper divisors (1).

581549346949 is an equidigital number, since it uses as much as digits as its factorization.

581549346949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 167961600, while the sum is 67.

The spelling of 581549346949 in words is "five hundred eighty-one billion, five hundred forty-nine million, three hundred forty-six thousand, nine hundred forty-nine".