19443792481 has 27 divisors (see below), whose sum is σ = 21151894323. Its totient is φ = 17870758560.

The previous prime is 19443792457. The next prime is 19443792499. The reversal of 19443792481 is 18429734491.

It is a happy number.

The square root of 19443792481 is 139441.

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

It can be written as a sum of positive squares in only one way, i.e., 936910881 + 18506881600 = 30609^2 + 136040^2 .

It is not a de Polignac number, because 19443792481 - 2¹¹ = 19443790433 is a prime.

It is a super-2 number, since 2×19443792481² (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 (19443792451) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 108624450 + ... + 108624628.

Almost surely, 2^19443792481 is an apocalyptic number.

19443792481 is the 139441-st square number.

19443792481 is the 69721-st centered octagonal number.

It is an amenable number.

19443792481 is a deficient number, since it is larger than the sum of its proper divisors (1708101842).

19443792481 is an frugal number, since it uses more digits than its factorization.

19443792481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 239 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 52.

The spelling of 19443792481 in words is "nineteen billion, four hundred forty-three million, seven hundred ninety-two thousand, four hundred eighty-one".