131221122429689 has 2 divisors, whose sum is σ = 131221122429690. Its totient is φ = 131221122429688.

The previous prime is 131221122429671. The next prime is 131221122429701. The reversal of 131221122429689 is 986924221122131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129767024090089 + 1454098339600 = 11391533^2 + 1205860^2 .

It is a cyclic number.

It is not a de Polignac number, because 131221122429689 - 2²⁸ = 131220853994233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131221122429689.

It is not a weakly prime, because it can be changed into another prime (131221122429289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610561214844 + 65610561214845.

It is an arithmetic number, because the mean of its divisors is an integer number (65610561214845).

Almost surely, 2^{131221122429689} is an apocalyptic number.

It is an amenable number.

131221122429689 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221122429689 is an equidigital number, since it uses as much as digits as its factorization.

131221122429689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 53.

The spelling of 131221122429689 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, four hundred twenty-nine thousand, six hundred eighty-nine".