1001020209 has 8 divisors (see below), whose sum is σ = 1525364160. Its totient is φ = 572011536.

The previous prime is 1001020171. The next prime is 1001020213. The reversal of 1001020209 is 9020201001.

It is a happy number.

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

It is not a de Polignac number, because 1001020209 - 2¹⁵ = 1000987441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001020249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23833794 + ... + 23833835.

It is an arithmetic number, because the mean of its divisors is an integer number (190670520).

Almost surely, 2^1001020209 is an apocalyptic number.

It is an amenable number.

1001020209 is a deficient number, since it is larger than the sum of its proper divisors (524343951).

1001020209 is an equidigital number, since it uses as much as digits as its factorization.

1001020209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47667639.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1001020209 is about 31638.9034102006. The cubic root of 1001020209 is about 1000.3399540848.

The spelling of 1001020209 in words is "one billion, one million, twenty thousand, two hundred nine".