19056974209 has 81 divisors (see below), whose sum is σ = 25287466491. Its totient is φ = 14312712960.

The previous prime is 19056974117. The next prime is 19056974263. The reversal of 19056974209 is 90247965091.

The square root of 19056974209 is 138047.

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

It can be written as a sum of positive squares in 13 ways, for example, as 17542207809 + 1514766400 = 132447^2 + 38920^2 .

It is not a de Polignac number, because 19056974209 - 2¹⁵ = 19056941441 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19056975209) 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 80 ways as a sum of consecutive naturals, for example, 464804229 + ... + 464804269.

Almost surely, 2^19056974209 is an apocalyptic number.

19056974209 is the 138047-th square number.

19056974209 is the 69024-th centered octagonal number.

It is an amenable number.

19056974209 is a deficient number, since it is larger than the sum of its proper divisors (6230492282).

19056974209 is an equidigital number, since it uses as much as digits as its factorization.

19056974209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 19056974209 in words is "nineteen billion, fifty-six million, nine hundred seventy-four thousand, two hundred nine".