1002101209 has 4 divisors (see below), whose sum is σ = 1004247504. Its totient is φ = 999954916.

The previous prime is 1002101161. The next prime is 1002101239. The reversal of 1002101209 is 9021012001.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002101209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002101192 and 1002101201.

It is not an unprimeable number, because it can be changed into a prime (1002101239) 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, 1072447 + ... + 1073380.

It is an arithmetic number, because the mean of its divisors is an integer number (251061876).

Almost surely, 2^1002101209 is an apocalyptic number.

It is an amenable number.

1002101209 is a deficient number, since it is larger than the sum of its proper divisors (2146295).

1002101209 is an equidigital number, since it uses as much as digits as its factorization.

1002101209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146294.

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

The square root of 1002101209 is about 31655.9821992621. The cubic root of 1002101209 is about 1000.6999130075.

The spelling of 1002101209 in words is "one billion, two million, one hundred one thousand, two hundred nine".