212453009 has 2 divisors, whose sum is σ = 212453010. Its totient is φ = 212453008.

The previous prime is 212452993. The next prime is 212453023. The reversal of 212453009 is 900354212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174900625 + 37552384 = 13225^2 + 6128^2 .

It is a cyclic number.

It is not a de Polignac number, because 212453009 - 2⁴ = 212452993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212453039) 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, 106226504 + 106226505.

It is an arithmetic number, because the mean of its divisors is an integer number (106226505).

Almost surely, 2^212453009 is an apocalyptic number.

It is an amenable number.

212453009 is a deficient number, since it is larger than the sum of its proper divisors (1).

212453009 is an equidigital number, since it uses as much as digits as its factorization.

212453009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 212453009 is about 14575.7678699957. The cubic root of 212453009 is about 596.6976060789.

The spelling of 212453009 in words is "two hundred twelve million, four hundred fifty-three thousand, nine".