19055317681 has 3 divisors (see below), whose sum is σ = 19055455723. Its totient is φ = 19055179640.

The previous prime is 19055317649. The next prime is 19055317693. The reversal of 19055317681 is 18671355091.

The square root of 19055317681 is 138041.

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., 18835092081 + 220225600 = 137241^2 + 14840^2 .

It is not a de Polignac number, because 19055317681 - 2⁵ = 19055317649 is a prime.

It is a super-2 number, since 2×19055317681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19055317621) 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, 69021 + ... + 207061.

Almost surely, 2^19055317681 is an apocalyptic number.

19055317681 is the 138041-st square number.

19055317681 is the 69021-st centered octagonal number.

It is an amenable number.

19055317681 is a deficient number, since it is larger than the sum of its proper divisors (138042).

19055317681 is an frugal number, since it uses more digits than its factorization.

19055317681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276082 (or 138041 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 19055317681 in words is "nineteen billion, fifty-five million, three hundred seventeen thousand, six hundred eighty-one".