12687109 has 2 divisors, whose sum is σ = 12687110. Its totient is φ = 12687108.

The previous prime is 12687089. The next prime is 12687113. The reversal of 12687109 is 90178621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 956484 = 3425^2 + 978^2 .

It is a cyclic number.

It is not a de Polignac number, because 12687109 - 2¹¹ = 12685061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12687119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6343554 + 6343555.

It is an arithmetic number, because the mean of its divisors is an integer number (6343555).

Almost surely, 2^12687109 is an apocalyptic number.

It is an amenable number.

12687109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12687109 is an equidigital number, since it uses as much as digits as its factorization.

12687109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12687109 is about 3561.8968261307. The cubic root of 12687109 is about 233.2316888347.

The spelling of 12687109 in words is "twelve million, six hundred eighty-seven thousand, one hundred nine".