1271443421889 has 15 divisors (see below), whose sum is σ = 1899331876497. Its totient is φ = 847622182428.

The previous prime is 1271443421869. The next prime is 1271443421909. The reversal of 1271443421889 is 9881243441721.

It is a happy number.

The square root of 1271443421889 is 1127583.

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

1271443421889 is a `hidden beast` number, since 1 + 2 + 71 + 443 + 42 + 18 + 89 = 666.

It is an interprime number because it is at equal distance from previous prime (1271443421869) and next prime (1271443421909).

It is not a de Polignac number, because 1271443421889 - 2⁹ = 1271443421377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1271443421869) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 10085604 + ... + 10210890.

Almost surely, 2^{1271443421889} is an apocalyptic number.

1271443421889 is the 1127583-rd square number.

1271443421889 is the 563792-nd centered octagonal number.

It is an amenable number.

1271443421889 is a deficient number, since it is larger than the sum of its proper divisors (627888454608).

1271443421889 is an frugal number, since it uses more digits than its factorization.

1271443421889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250586 (or 125290 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 1271443421889 in words is "one trillion, two hundred seventy-one billion, four hundred forty-three million, four hundred twenty-one thousand, eight hundred eighty-nine".