12187608409 has 2 divisors, whose sum is σ = 12187608410. Its totient is φ = 12187608408.

The previous prime is 12187608361. The next prime is 12187608413. The reversal of 12187608409 is 90480678121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10125994384 + 2061614025 = 100628^2 + 45405^2 .

It is a cyclic number.

It is not a de Polignac number, because 12187608409 - 2⁹ = 12187607897 is a prime.

It is a super-2 number, since 2×12187608409² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12187608479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6093804204 + 6093804205.

It is an arithmetic number, because the mean of its divisors is an integer number (6093804205).

Almost surely, 2^12187608409 is an apocalyptic number.

It is an amenable number.

12187608409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12187608409 is an equidigital number, since it uses as much as digits as its factorization.

12187608409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 12187608409 in words is "twelve billion, one hundred eighty-seven million, six hundred eight thousand, four hundred nine".