19170340849 has 27 divisors (see below), whose sum is σ = 21668587563. Its totient is φ = 16947136800.

The previous prime is 19170340843. The next prime is 19170340927. The reversal of 19170340849 is 94804307191.

The square root of 19170340849 is 138457.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 923734449 + 18246606400 = 30393^2 + 135080^2 .

It is not a de Polignac number, because 19170340849 - 2¹⁷ = 19170209777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19170340799 and 19170340808.

It is not an unprimeable number, because it can be changed into a prime (19170340843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 62443954 + ... + 62444260.

Almost surely, 2^19170340849 is an apocalyptic number.

19170340849 is the 138457-th square number.

19170340849 is the 69229-th centered octagonal number.

It is an amenable number.

19170340849 is a deficient number, since it is larger than the sum of its proper divisors (2498246714).

19170340849 is an frugal number, since it uses more digits than its factorization.

19170340849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 19170340849 in words is "nineteen billion, one hundred seventy million, three hundred forty thousand, eight hundred forty-nine".