202002020197 has 4 divisors (see below), whose sum is σ = 202002942636. Its totient is φ = 202001097760.

The previous prime is 202002020191. The next prime is 202002020201. The reversal of 202002020197 is 791020200202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 112577696676 + 89424323521 = 335526^2 + 299039^2 .

It is a cyclic number.

It is not a de Polignac number, because 202002020197 - 2³ = 202002020189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202002020191) 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 3 ways as a sum of consecutive naturals, for example, 75297 + ... + 640057.

It is an arithmetic number, because the mean of its divisors is an integer number (50500735659).

Almost surely, 2^202002020197 is an apocalyptic number.

It is an amenable number.

202002020197 is a deficient number, since it is larger than the sum of its proper divisors (922439).

202002020197 is an equidigital number, since it uses as much as digits as its factorization.

202002020197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922438.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 202002020197 its reverse (791020200202), we get a palindrome (993022220399).

The spelling of 202002020197 in words is "two hundred two billion, two million, twenty thousand, one hundred ninety-seven".