19804651441 has 3 divisors (see below), whose sum is σ = 19804792171. Its totient is φ = 19804510712.

The previous prime is 19804651429. The next prime is 19804651499. The reversal of 19804651441 is 14415640891.

The square root of 19804651441 is 140729.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14415640891 = 48757 ⋅295663.

It can be written as a sum of positive squares in only one way, i.e., 18914225841 + 890425600 = 137529^2 + 29840^2 .

It is not a de Polignac number, because 19804651441 - 2²⁹ = 19267780529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19804651421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70365 + ... + 211093.

Almost surely, 2^19804651441 is an apocalyptic number.

19804651441 is the 140729-th square number.

19804651441 is the 70365-th centered octagonal number.

It is an amenable number.

19804651441 is a deficient number, since it is larger than the sum of its proper divisors (140730).

19804651441 is an frugal number, since it uses more digits than its factorization.

19804651441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281458 (or 140729 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 19804651441 in words is "nineteen billion, eight hundred four million, six hundred fifty-one thousand, four hundred forty-one".