10202009 has 2 divisors, whose sum is σ = 10202010. Its totient is φ = 10202008.

The previous prime is 10201987. The next prime is 10202021. The reversal of 10202009 is 90020201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5161984 + 5040025 = 2272^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202009 - 2²⁰ = 9153433 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 10201984 and 10202002.

It is not a weakly prime, because it can be changed into another prime (10202099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101004 + 5101005.

It is an arithmetic number, because the mean of its divisors is an integer number (5101005).

Almost surely, 2^10202009 is an apocalyptic number.

It is an amenable number.

10202009 is a deficient number, since it is larger than the sum of its proper divisors (1).

10202009 is an equidigital number, since it uses as much as digits as its factorization.

10202009 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 10202009 is about 3194.0583901989. The cubic root of 10202009 is about 216.8845259044.

The spelling of 10202009 in words is "ten million, two hundred two thousand, nine".