1271742991289 has 16 divisors (see below), whose sum is σ = 1315314033600. Its totient is φ = 1228661628480.

The previous prime is 1271742991271. The next prime is 1271742991367. The reversal of 1271742991289 is 9821992471721.

It is not a de Polignac number, because 1271742991289 - 2²⁸ = 1271474555833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271742991219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17401154 + ... + 17474084.

It is an arithmetic number, because the mean of its divisors is an integer number (82207127100).

Almost surely, 2^{1271742991289} is an apocalyptic number.

It is an amenable number.

1271742991289 is a deficient number, since it is larger than the sum of its proper divisors (43571042311).

1271742991289 is a wasteful number, since it uses less digits than its factorization.

1271742991289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76280.

The product of its digits is 9144576, while the sum is 62.

The spelling of 1271742991289 in words is "one trillion, two hundred seventy-one billion, seven hundred forty-two million, nine hundred ninety-one thousand, two hundred eighty-nine".