202195991 has 2 divisors, whose sum is σ = 202195992. Its totient is φ = 202195990.

The previous prime is 202195963. The next prime is 202195993. The reversal of 202195991 is 199591202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202195991 is a prime.

It is a Sophie Germain prime.

Together with 202195993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202195993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101097995 + 101097996.

It is an arithmetic number, because the mean of its divisors is an integer number (101097996).

Almost surely, 2^202195991 is an apocalyptic number.

202195991 is a deficient number, since it is larger than the sum of its proper divisors (1).

202195991 is an equidigital number, since it uses as much as digits as its factorization.

202195991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 202195991 is about 14219.5636712242. The cubic root of 202195991 is about 586.9361335633.

The spelling of 202195991 in words is "two hundred two million, one hundred ninety-five thousand, nine hundred ninety-one".