1001012209 has 4 divisors (see below), whose sum is σ = 1001199616. Its totient is φ = 1000824804.

The previous prime is 1001012203. The next prime is 1001012237. The reversal of 1001012209 is 9022101001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9022101001 = 281 ⋅32107121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001012209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001012192 and 1001012201.

It is not an unprimeable number, because it can be changed into a prime (1001012203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85449 + ... + 96454.

It is an arithmetic number, because the mean of its divisors is an integer number (250299904).

Almost surely, 2^1001012209 is an apocalyptic number.

It is an amenable number.

1001012209 is a deficient number, since it is larger than the sum of its proper divisors (187407).

1001012209 is an equidigital number, since it uses as much as digits as its factorization.

1001012209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187406.

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

The square root of 1001012209 is about 31638.7769833159. The cubic root of 1001012209 is about 1000.3372892232.

The spelling of 1001012209 in words is "one billion, one million, twelve thousand, two hundred nine".