1210220009 has 4 divisors (see below), whose sum is σ = 1211594580. Its totient is φ = 1208845440.

The previous prime is 1210219973. The next prime is 1210220017. The reversal of 1210220009 is 9000220121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 553425625 + 656794384 = 23525^2 + 25628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210220009 - 2²⁸ = 941784553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1210220059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685964 + ... + 687725.

It is an arithmetic number, because the mean of its divisors is an integer number (302898645).

Almost surely, 2^1210220009 is an apocalyptic number.

It is an amenable number.

1210220009 is a deficient number, since it is larger than the sum of its proper divisors (1374571).

1210220009 is an equidigital number, since it uses as much as digits as its factorization.

1210220009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374570.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1210220009 is about 34788.2165251397. The cubic root of 1210220009 is about 1065.6668174484. Note that the first 3 decimals are identical.

The spelling of 1210220009 in words is "one billion, two hundred ten million, two hundred twenty thousand, nine".