202002122009 has 2 divisors, whose sum is σ = 202002122010. Its totient is φ = 202002122008.

The previous prime is 202002121949. The next prime is 202002122033. The reversal of 202002122009 is 900221200202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124606882009 + 77395240000 = 352997^2 + 278200^2 .

It is a cyclic number.

It is not a de Polignac number, because 202002122009 - 2¹² = 202002117913 is a prime.

It is a super-2 number, since 2×202002122009² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (202002122059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101001061004 + 101001061005.

It is an arithmetic number, because the mean of its divisors is an integer number (101001061005).

Almost surely, 2^202002122009 is an apocalyptic number.

It is an amenable number.

202002122009 is a deficient number, since it is larger than the sum of its proper divisors (1).

202002122009 is an equidigital number, since it uses as much as digits as its factorization.

202002122009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 202002122009 in words is "two hundred two billion, two million, one hundred twenty-two thousand, nine".