19549238449 has 8 divisors (see below), whose sum is σ = 21054859112. Its totient is φ = 18043879680.

The previous prime is 19549238437. The next prime is 19549238473. The reversal of 19549238449 is 94483294591.

It can be written as a sum of positive squares in 4 ways, for example, as 6604487824 + 12944750625 = 81268^2 + 113775^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19549238449 - 2¹⁹ = 19548714161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19549238393 and 19549238402.

It is not an unprimeable number, because it can be changed into a prime (19549238549) 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 in 7 ways as a sum of consecutive naturals, for example, 106267 + ... + 224479.

It is an arithmetic number, because the mean of its divisors is an integer number (2631857389).

Almost surely, 2^19549238449 is an apocalyptic number.

It is an amenable number.

19549238449 is a deficient number, since it is larger than the sum of its proper divisors (1505620663).

19549238449 is a wasteful number, since it uses less digits than its factorization.

19549238449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130947.

The product of its digits is 11197440, while the sum is 58.

The spelling of 19549238449 in words is "nineteen billion, five hundred forty-nine million, two hundred thirty-eight thousand, four hundred forty-nine".