1209481843121 has 2 divisors, whose sum is σ = 1209481843122. Its totient is φ = 1209481843120.

The previous prime is 1209481843111. The next prime is 1209481843153. The reversal of 1209481843121 is 1213481849021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1203639381025 + 5842462096 = 1097105^2 + 76436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209481843121 - 2¹⁴ = 1209481826737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209481843111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604740921560 + 604740921561.

It is an arithmetic number, because the mean of its divisors is an integer number (604740921561).

Almost surely, 2^{1209481843121} is an apocalyptic number.

It is an amenable number.

1209481843121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209481843121 is an equidigital number, since it uses as much as digits as its factorization.

1209481843121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 1209481843121 in words is "one trillion, two hundred nine billion, four hundred eighty-one million, eight hundred forty-three thousand, one hundred twenty-one".