12461809 has 2 divisors, whose sum is σ = 12461810. Its totient is φ = 12461808.

The previous prime is 12461807. The next prime is 12461831. The reversal of 12461809 is 90816421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8832784 + 3629025 = 2972^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 12461809 - 2¹ = 12461807 is a prime.

Together with 12461807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12461807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6230904 + 6230905.

It is an arithmetic number, because the mean of its divisors is an integer number (6230905).

Almost surely, 2^12461809 is an apocalyptic number.

It is an amenable number.

12461809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12461809 is an equidigital number, since it uses as much as digits as its factorization.

12461809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 12461809 is about 3530.1287511931. The cubic root of 12461809 is about 231.8428446679.

The spelling of 12461809 in words is "twelve million, four hundred sixty-one thousand, eight hundred nine".