212146309 has 2 divisors, whose sum is σ = 212146310. Its totient is φ = 212146308.

The previous prime is 212146211. The next prime is 212146327. The reversal of 212146309 is 903641212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128368900 + 83777409 = 11330^2 + 9153^2 .

It is a cyclic number.

It is not a de Polignac number, because 212146309 - 2¹³ = 212138117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212146369) 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, 106073154 + 106073155.

It is an arithmetic number, because the mean of its divisors is an integer number (106073155).

Almost surely, 2^212146309 is an apocalyptic number.

It is an amenable number.

212146309 is a deficient number, since it is larger than the sum of its proper divisors (1).

212146309 is an equidigital number, since it uses as much as digits as its factorization.

212146309 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 28.

The square root of 212146309 is about 14565.2431836890. The cubic root of 212146309 is about 596.4103342547.

The spelling of 212146309 in words is "two hundred twelve million, one hundred forty-six thousand, three hundred nine".