202002191 has 2 divisors, whose sum is σ = 202002192. Its totient is φ = 202002190.

The previous prime is 202002187. The next prime is 202002223. The reversal of 202002191 is 191200202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202002191 - 2² = 202002187 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202002391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101001095 + 101001096.

It is an arithmetic number, because the mean of its divisors is an integer number (101001096).

Almost surely, 2^202002191 is an apocalyptic number.

202002191 is a deficient number, since it is larger than the sum of its proper divisors (1).

202002191 is an equidigital number, since it uses as much as digits as its factorization.

202002191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 202002191 is about 14212.7474824539. The cubic root of 202002191 is about 586.7485522251.

Adding to 202002191 its reverse (191200202), we get a palindrome (393202393).

The spelling of 202002191 in words is "two hundred two million, two thousand, one hundred ninety-one".