211301309 has 2 divisors, whose sum is σ = 211301310. Its totient is φ = 211301308.

The previous prime is 211301303. The next prime is 211301341. The reversal of 211301309 is 903103112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146047225 + 65254084 = 12085^2 + 8078^2 .

It is a cyclic number.

It is not a de Polignac number, because 211301309 - 2¹² = 211297213 is a prime.

It is a super-2 number, since 2×211301309² = 89296486370226962, which contains 22 as substring.

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 (211301303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105650654 + 105650655.

It is an arithmetic number, because the mean of its divisors is an integer number (105650655).

Almost surely, 2^211301309 is an apocalyptic number.

It is an amenable number.

211301309 is a deficient number, since it is larger than the sum of its proper divisors (1).

211301309 is an equidigital number, since it uses as much as digits as its factorization.

211301309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 211301309 is about 14536.2068298439. The cubic root of 211301309 is about 595.6174265423.

The spelling of 211301309 in words is "two hundred eleven million, three hundred one thousand, three hundred nine".