1281045939889 has 9 divisors (see below), whose sum is σ = 1297557541497. Its totient is φ = 1264741885524.

The previous prime is 1281045939881. The next prime is 1281045939913. The reversal of 1281045939889 is 9889395401821.

The square root of 1281045939889 is 1131833.

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

It is not a de Polignac number, because 1281045939889 - 2³ = 1281045939881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281045939881) 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 8 ways as a sum of consecutive naturals, for example, 89407644 + ... + 89421970.

Almost surely, 2^{1281045939889} is an apocalyptic number.

1281045939889 is the 1131833-rd square number.

1281045939889 is the 565917-th centered octagonal number.

It is an amenable number.

1281045939889 is a deficient number, since it is larger than the sum of its proper divisors (16511601608).

1281045939889 is an frugal number, since it uses more digits than its factorization.

1281045939889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28812 (or 14406 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 67.

The spelling of 1281045939889 in words is "one trillion, two hundred eighty-one billion, forty-five million, nine hundred thirty-nine thousand, eight hundred eighty-nine".