1000211209 has 2 divisors, whose sum is σ = 1000211210. Its totient is φ = 1000211208.

The previous prime is 1000211207. The next prime is 1000211227. The reversal of 1000211209 is 9021120001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646583184 + 353628025 = 25428^2 + 18805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000211209 - 2¹ = 1000211207 is a prime.

Together with 1000211207, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1000211192 and 1000211201.

It is not a weakly prime, because it can be changed into another prime (1000211207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500105604 + 500105605.

It is an arithmetic number, because the mean of its divisors is an integer number (500105605).

Almost surely, 2^1000211209 is an apocalyptic number.

It is an amenable number.

1000211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000211209 is an equidigital number, since it uses as much as digits as its factorization.

1000211209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1000211209 is about 31626.1159328805. The cubic root of 1000211209 is about 1000.0703980440.

The spelling of 1000211209 in words is "one billion, two hundred eleven thousand, two hundred nine".