1002002009 has 2 divisors, whose sum is σ = 1002002010. Its totient is φ = 1002002008.

The previous prime is 1002001991. The next prime is 1002002021. The reversal of 1002002009 is 9002002001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1001406025 + 595984 = 31645^2 + 772^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002002009 - 2¹⁶ = 1001936473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002001984 and 1002002002.

It is not a weakly prime, because it can be changed into another prime (1002002609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501001004 + 501001005.

It is an arithmetic number, because the mean of its divisors is an integer number (501001005).

Almost surely, 2^1002002009 is an apocalyptic number.

It is an amenable number.

1002002009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002002009 is an equidigital number, since it uses as much as digits as its factorization.

1002002009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1002002009 is about 31654.4153160345. The cubic root of 1002002009 is about 1000.6668914902. Note that the first 3 decimals are identical.

The spelling of 1002002009 in words is "one billion, two million, two thousand, nine".