853213409 has 2 divisors, whose sum is σ = 853213410. Its totient is φ = 853213408.

The previous prime is 853213397. The next prime is 853213423. The reversal of 853213409 is 904312358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756250000 + 96963409 = 27500^2 + 9847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853213409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (853213429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426606704 + 426606705.

It is an arithmetic number, because the mean of its divisors is an integer number (426606705).

Almost surely, 2^853213409 is an apocalyptic number.

It is an amenable number.

853213409 is a deficient number, since it is larger than the sum of its proper divisors (1).

853213409 is an equidigital number, since it uses as much as digits as its factorization.

853213409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 853213409 is about 29209.8169970303. The cubic root of 853213409 is about 948.4604459846.

The spelling of 853213409 in words is "eight hundred fifty-three million, two hundred thirteen thousand, four hundred nine".