422641309 has 2 divisors, whose sum is σ = 422641310. Its totient is φ = 422641308.

The previous prime is 422641291. The next prime is 422641313. The reversal of 422641309 is 903146224.

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., 236236900 + 186404409 = 15370^2 + 13653^2 .

It is a cyclic number.

It is not a de Polignac number, because 422641309 - 2⁵ = 422641277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422641409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211320654 + 211320655.

It is an arithmetic number, because the mean of its divisors is an integer number (211320655).

Almost surely, 2^422641309 is an apocalyptic number.

It is an amenable number.

422641309 is a deficient number, since it is larger than the sum of its proper divisors (1).

422641309 is an equidigital number, since it uses as much as digits as its factorization.

422641309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 422641309 is about 20558.2418752188. The cubic root of 422641309 is about 750.4538343608.

The spelling of 422641309 in words is "four hundred twenty-two million, six hundred forty-one thousand, three hundred nine".