19749524089 has 3 divisors (see below), whose sum is σ = 19749664623. Its totient is φ = 19749383556.

The previous prime is 19749524083. The next prime is 19749524099. The reversal of 19749524089 is 98042594791.

The square root of 19749524089 is 140533.

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

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 only one way, i.e., 342805225 + 19406718864 = 18515^2 + 139308^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19749524089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19749524083) 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 2 ways as a sum of consecutive naturals, for example, 70267 + ... + 210799.

It is an arithmetic number, because the mean of its divisors is an integer number (6583221541).

Almost surely, 2^19749524089 is an apocalyptic number.

19749524089 is the 140533-rd square number.

19749524089 is the 70267-th centered octagonal number.

It is an amenable number.

19749524089 is a deficient number, since it is larger than the sum of its proper divisors (140534).

19749524089 is an frugal number, since it uses more digits than its factorization.

19749524089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281066 (or 140533 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 19749524089 in words is "nineteen billion, seven hundred forty-nine million, five hundred twenty-four thousand, eighty-nine".