90199910191 has 2 divisors, whose sum is σ = 90199910192. Its totient is φ = 90199910190.

The previous prime is 90199910189. The next prime is 90199910209. The reversal of 90199910191 is 19101999109.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90199910191 - 2¹ = 90199910189 is a prime.

Together with 90199910189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90199913191) 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 as a sum of consecutive naturals, namely, 45099955095 + 45099955096.

It is an arithmetic number, because the mean of its divisors is an integer number (45099955096).

Almost surely, 2^90199910191 is an apocalyptic number.

90199910191 is a deficient number, since it is larger than the sum of its proper divisors (1).

90199910191 is an equidigital number, since it uses as much as digits as its factorization.

90199910191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59049, while the sum is 49.

The spelling of 90199910191 in words is "ninety billion, one hundred ninety-nine million, nine hundred ten thousand, one hundred ninety-one".