1211000009 has 8 divisors (see below), whose sum is σ = 1271458560. Its totient is φ = 1151788176.

The previous prime is 1210999987. The next prime is 1211000023. The reversal of 1211000009 is 9000001121.

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 1211000009 - 2⁸ = 1210999753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1210999957 and 1211000002.

It is not an unprimeable number, because it can be changed into a prime (1211000029) 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 in 7 ways as a sum of consecutive naturals, for example, 309689 + ... + 313574.

It is an arithmetic number, because the mean of its divisors is an integer number (158932320).

Almost surely, 2^1211000009 is an apocalyptic number.

It is an amenable number.

1211000009 is a deficient number, since it is larger than the sum of its proper divisors (60458551).

1211000009 is an equidigital number, since it uses as much as digits as its factorization.

1211000009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623359.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1211000009 is about 34799.4254119231. The cubic root of 1211000009 is about 1065.8957129105.

The spelling of 1211000009 in words is "one billion, two hundred eleven million, nine", and thus it is an aban number.