12161352209 has 2 divisors, whose sum is σ = 12161352210. Its totient is φ = 12161352208.

The previous prime is 12161352197. The next prime is 12161352377. The reversal of 12161352209 is 90225316121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11219046400 + 942305809 = 105920^2 + 30697^2 .

It is an emirp because it is prime and its reverse (90225316121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12161352209 - 2²⁰ = 12160303633 is a prime.

It is not a weakly prime, because it can be changed into another prime (12161352409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6080676104 + 6080676105.

It is an arithmetic number, because the mean of its divisors is an integer number (6080676105).

Almost surely, 2^12161352209 is an apocalyptic number.

It is an amenable number.

12161352209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12161352209 is an equidigital number, since it uses as much as digits as its factorization.

12161352209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 12161352209 in words is "twelve billion, one hundred sixty-one million, three hundred fifty-two thousand, two hundred nine".