212069309 has 2 divisors, whose sum is σ = 212069310. Its totient is φ = 212069308.

The previous prime is 212069303. The next prime is 212069323. The reversal of 212069309 is 903960212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166978084 + 45091225 = 12922^2 + 6715^2 .

It is a cyclic number.

It is not a de Polignac number, because 212069309 - 2⁴ = 212069293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212069303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106034654 + 106034655.

It is an arithmetic number, because the mean of its divisors is an integer number (106034655).

Almost surely, 2^212069309 is an apocalyptic number.

It is an amenable number.

212069309 is a deficient number, since it is larger than the sum of its proper divisors (1).

212069309 is an equidigital number, since it uses as much as digits as its factorization.

212069309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 212069309 is about 14562.5996648950. The cubic root of 212069309 is about 596.3381684097.

The spelling of 212069309 in words is "two hundred twelve million, sixty-nine thousand, three hundred nine".