12922409 has 2 divisors, whose sum is σ = 12922410. Its totient is φ = 12922408.

The previous prime is 12922373. The next prime is 12922411. The reversal of 12922409 is 90422921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 2650384 = 3205^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 12922409 - 2⁸ = 12922153 is a prime.

Together with 12922411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12922709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6461204 + 6461205.

It is an arithmetic number, because the mean of its divisors is an integer number (6461205).

Almost surely, 2^12922409 is an apocalyptic number.

It is an amenable number.

12922409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12922409 is an equidigital number, since it uses as much as digits as its factorization.

12922409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 12922409 is about 3594.7752363674. The cubic root of 12922409 is about 234.6647339268.

It can be divided in two parts, 12922 and 409, that added together give a palindrome (13331).

The spelling of 12922409 in words is "twelve million, nine hundred twenty-two thousand, four hundred nine".