12161594989 has 2 divisors, whose sum is σ = 12161594990. Its totient is φ = 12161594988.

The previous prime is 12161594983. The next prime is 12161595037. The reversal of 12161594989 is 98949516121.

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., 11396630025 + 764964964 = 106755^2 + 27658^2 .

It is an emirp because it is prime and its reverse (98949516121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12161594989 - 2⁵ = 12161594957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12161594983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6080797494 + 6080797495.

It is an arithmetic number, because the mean of its divisors is an integer number (6080797495).

Almost surely, 2^12161594989 is an apocalyptic number.

It is an amenable number.

12161594989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12161594989 is an equidigital number, since it uses as much as digits as its factorization.

12161594989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 55.

The spelling of 12161594989 in words is "twelve billion, one hundred sixty-one million, five hundred ninety-four thousand, nine hundred eighty-nine".