90910100191 has 2 divisors, whose sum is σ = 90910100192. Its totient is φ = 90910100190.

The previous prime is 90910100161. The next prime is 90910100209. The reversal of 90910100191 is 19100101909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90910100191 - 2¹¹ = 90910098143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90910100161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45455050095 + 45455050096.

It is an arithmetic number, because the mean of its divisors is an integer number (45455050096).

Almost surely, 2^90910100191 is an apocalyptic number.

90910100191 is a deficient number, since it is larger than the sum of its proper divisors (1).

90910100191 is an equidigital number, since it uses as much as digits as its factorization.

90910100191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 31.

The spelling of 90910100191 in words is "ninety billion, nine hundred ten million, one hundred thousand, one hundred ninety-one".