211342609 has 2 divisors, whose sum is σ = 211342610. Its totient is φ = 211342608.

The previous prime is 211342591. The next prime is 211342619. The reversal of 211342609 is 906243112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135652609 + 75690000 = 11647^2 + 8700^2 .

It is a cyclic number.

It is not a de Polignac number, because 211342609 - 2¹⁵ = 211309841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211342619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105671304 + 105671305.

It is an arithmetic number, because the mean of its divisors is an integer number (105671305).

Almost surely, 2^211342609 is an apocalyptic number.

It is an amenable number.

211342609 is a deficient number, since it is larger than the sum of its proper divisors (1).

211342609 is an equidigital number, since it uses as much as digits as its factorization.

211342609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 211342609 is about 14537.6273511189. The cubic root of 211342609 is about 595.6562295788.

The spelling of 211342609 in words is "two hundred eleven million, three hundred forty-two thousand, six hundred nine".