1271843212109 has 8 divisors (see below), whose sum is σ = 1302926908920. Its totient is φ = 1240762521600.

The previous prime is 1271843212097. The next prime is 1271843212111. The reversal of 1271843212109 is 9012123481721.

It can be written as a sum of positive squares in 4 ways, for example, as 23148709609 + 1248694502500 = 152147^2 + 1117450^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1271843212109 - 2²⁸ = 1271574776653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271843212139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116999 + ... + 1599179.

It is an arithmetic number, because the mean of its divisors is an integer number (162865863615).

Almost surely, 2^{1271843212109} is an apocalyptic number.

It is an amenable number.

1271843212109 is a deficient number, since it is larger than the sum of its proper divisors (31083696811).

1271843212109 is a wasteful number, since it uses less digits than its factorization.

1271843212109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503151.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 1271843212109 in words is "one trillion, two hundred seventy-one billion, eight hundred forty-three million, two hundred twelve thousand, one hundred nine".