19451044089 has 9 divisors (see below), whose sum is σ = 28096556943. Its totient is φ = 12967083792.

The previous prime is 19451044027. The next prime is 19451044121. The reversal of 19451044089 is 98044015491.

It is a happy number.

The square root of 19451044089 is 139467.

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

19451044089 is a `hidden beast` number, since 1 + 94 + 510 + 4 + 40 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7864674489 + 11586369600 = 88683^2 + 107640^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-19451044089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19451044009) 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 8 ways as a sum of consecutive naturals, for example, 395157 + ... + 441645.

Almost surely, 2^19451044089 is an apocalyptic number.

19451044089 is the 139467-th square number.

19451044089 is the 69734-th centered octagonal number.

It is an amenable number.

19451044089 is a deficient number, since it is larger than the sum of its proper divisors (8645512854).

19451044089 is an frugal number, since it uses more digits than its factorization.

19451044089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92984 (or 46492 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 19451044089 in words is "nineteen billion, four hundred fifty-one million, forty-four thousand, eighty-nine".