211000309 has 8 divisors (see below), whose sum is σ = 232773912. Its totient is φ = 190018560.

The previous prime is 211000247. The next prime is 211000313. The reversal of 211000309 is 903000112.

It can be written as a sum of positive squares in 4 ways, for example, as 5880625 + 205119684 = 2425^2 + 14322^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211000309 - 2⁹ = 210999797 is a prime.

It is a super-2 number, since 2×211000309² = 89042260796190962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211000292 and 211000301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211000369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197404 + ... + 198469.

It is an arithmetic number, because the mean of its divisors is an integer number (29096739).

Almost surely, 2^211000309 is an apocalyptic number.

It is an amenable number.

211000309 is a deficient number, since it is larger than the sum of its proper divisors (21773603).

211000309 is a wasteful number, since it uses less digits than its factorization.

211000309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395927.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 211000309 is about 14525.8496825487. The cubic root of 211000309 is about 595.3344719271.

The spelling of 211000309 in words is "two hundred eleven million, three hundred nine", and thus it is an aban number.