212344309 has 2 divisors, whose sum is σ = 212344310. Its totient is φ = 212344308.

The previous prime is 212344291. The next prime is 212344333. The reversal of 212344309 is 903443212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170224209 + 42120100 = 13047^2 + 6490^2 .

It is a cyclic number.

It is not a de Polignac number, because 212344309 - 2¹¹ = 212342261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212344609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106172154 + 106172155.

It is an arithmetic number, because the mean of its divisors is an integer number (106172155).

Almost surely, 2^212344309 is an apocalyptic number.

It is an amenable number.

212344309 is a deficient number, since it is larger than the sum of its proper divisors (1).

212344309 is an equidigital number, since it uses as much as digits as its factorization.

212344309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 212344309 is about 14572.0386013763. The cubic root of 212344309 is about 596.5958234225.

The spelling of 212344309 in words is "two hundred twelve million, three hundred forty-four thousand, three hundred nine".