19444389361 has 4 divisors (see below), whose sum is σ = 19450030500. Its totient is φ = 19438748224.

The previous prime is 19444389329. The next prime is 19444389373. The reversal of 19444389361 is 16398344491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67749361 + 19376640000 = 8231^2 + 139200^2 .

It is a cyclic number.

It is not a de Polignac number, because 19444389361 - 2⁵ = 19444389329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19444389299 and 19444389308.

It is not an unprimeable number, because it can be changed into a prime (19444389161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2815396 + ... + 2822293.

It is an arithmetic number, because the mean of its divisors is an integer number (4862507625).

Almost surely, 2^19444389361 is an apocalyptic number.

It is an amenable number.

19444389361 is a deficient number, since it is larger than the sum of its proper divisors (5641139).

19444389361 is an equidigital number, since it uses as much as digits as its factorization.

19444389361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5641138.

The product of its digits is 2239488, while the sum is 52.

The spelling of 19444389361 in words is "nineteen billion, four hundred forty-four million, three hundred eighty-nine thousand, three hundred sixty-one".