12654809 has 2 divisors, whose sum is σ = 12654810. Its totient is φ = 12654808.

The previous prime is 12654793. The next prime is 12654833. The reversal of 12654809 is 90845621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8832784 + 3822025 = 2972^2 + 1955^2 .

It is an emirp because it is prime and its reverse (90845621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12654809 - 2⁴ = 12654793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12650809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327404 + 6327405.

It is an arithmetic number, because the mean of its divisors is an integer number (6327405).

Almost surely, 2^12654809 is an apocalyptic number.

It is an amenable number.

12654809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12654809 is an equidigital number, since it uses as much as digits as its factorization.

12654809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 12654809 is about 3557.3598356084. The cubic root of 12654809 is about 233.0335931229.

The spelling of 12654809 in words is "twelve million, six hundred fifty-four thousand, eight hundred nine".