19126444049 has 4 divisors (see below), whose sum is σ = 19126726836. Its totient is φ = 19126161264.

The previous prime is 19126444039. The next prime is 19126444067. The reversal of 19126444049 is 94044462191.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7698834049 + 11427610000 = 87743^2 + 106900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19126444049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19126444009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26567 + ... + 197379.

It is an arithmetic number, because the mean of its divisors is an integer number (4781681709).

Almost surely, 2^19126444049 is an apocalyptic number.

It is an amenable number.

19126444049 is a deficient number, since it is larger than the sum of its proper divisors (282787).

19126444049 is a wasteful number, since it uses less digits than its factorization.

19126444049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282786.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 19126444049 in words is "nineteen billion, one hundred twenty-six million, four hundred forty-four thousand, forty-nine".