1281125169424 has 135 divisors (see below), whose sum is σ = 2679593565999. Its totient is φ = 593279930880.

The previous prime is 1281125169419. The next prime is 1281125169431. The reversal of 1281125169424 is 4249615211821.

The square root of 1281125169424 is 1131868.

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

It can be written as a sum of positive squares in 4 ways, for example, as 202086211600 + 1079038957824 = 449540^2 + 1038768^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4559164164 + ... + 4559164444.

Almost surely, 2^{1281125169424} is an apocalyptic number.

1281125169424 is the 1131868-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281125169424

1281125169424 is an abundant number, since it is smaller than the sum of its proper divisors (1398468396575).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281125169424 is an frugal number, since it uses more digits than its factorization.

1281125169424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 355 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The spelling of 1281125169424 in words is "one trillion, two hundred eighty-one billion, one hundred twenty-five million, one hundred sixty-nine thousand, four hundred twenty-four".