12681619 has 2 divisors, whose sum is σ = 12681620. Its totient is φ = 12681618.

The previous prime is 12681601. The next prime is 12681623. The reversal of 12681619 is 91618621.

It is a strong prime.

It is an emirp because it is prime and its reverse (91618621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12681619 - 2¹¹ = 12679571 is a prime.

It is a super-2 number, since 2×12681619² = 321646920922322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12681629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6340809 + 6340810.

It is an arithmetic number, because the mean of its divisors is an integer number (6340810).

Almost surely, 2^12681619 is an apocalyptic number.

12681619 is a deficient number, since it is larger than the sum of its proper divisors (1).

12681619 is an equidigital number, since it uses as much as digits as its factorization.

12681619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 12681619 is about 3561.1260859453. The cubic root of 12681619 is about 233.1980424327.

The spelling of 12681619 in words is "twelve million, six hundred eighty-one thousand, six hundred nineteen".