1002011209 has 8 divisors (see below), whose sum is σ = 1009465160. Its totient is φ = 994571136.

The previous prime is 1002011201. The next prime is 1002011221. The reversal of 1002011209 is 9021102001.

It can be written as a sum of positive squares in 4 ways, for example, as 36542025 + 965469184 = 6045^2 + 31072^2 .

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

It is not a de Polignac number, because 1002011209 - 2³ = 1002011201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002011192 and 1002011201.

It is not an unprimeable number, because it can be changed into a prime (1002011201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174427 + ... + 180079.

It is an arithmetic number, because the mean of its divisors is an integer number (126183145).

Almost surely, 2^1002011209 is an apocalyptic number.

It is an amenable number.

1002011209 is a deficient number, since it is larger than the sum of its proper divisors (7453951).

1002011209 is a wasteful number, since it uses less digits than its factorization.

1002011209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939.

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

The square root of 1002011209 is about 31654.5606350807. The cubic root of 1002011209 is about 1000.6699540613.

The spelling of 1002011209 in words is "one billion, two million, eleven thousand, two hundred nine".