71844841121 has 4 divisors (see below), whose sum is σ = 72302451732. Its totient is φ = 71387230512.

The previous prime is 71844841099. The next prime is 71844841139. The reversal of 71844841121 is 12114844817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48153474721 + 23691366400 = 219439^2 + 153920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71844841121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71844841421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228805070 + ... + 228805383.

It is an arithmetic number, because the mean of its divisors is an integer number (18075612933).

Almost surely, 2^71844841121 is an apocalyptic number.

It is an amenable number.

71844841121 is a deficient number, since it is larger than the sum of its proper divisors (457610611).

71844841121 is a wasteful number, since it uses less digits than its factorization.

71844841121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457610610.

The product of its digits is 57344, while the sum is 41.

The spelling of 71844841121 in words is "seventy-one billion, eight hundred forty-four million, eight hundred forty-one thousand, one hundred twenty-one".