91000195 has 32 divisors (see below), whose sum is σ = 129366720. Its totient is φ = 60579840.

The previous prime is 91000193. The next prime is 91000207. The reversal of 91000195 is 59100019.

It is not a de Polignac number, because 91000195 - 2¹ = 91000193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91000193) 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 in 31 ways as a sum of consecutive naturals, for example, 97491 + ... + 98419.

It is an arithmetic number, because the mean of its divisors is an integer number (4042710).

Almost surely, 2^91000195 is an apocalyptic number.

91000195 is a deficient number, since it is larger than the sum of its proper divisors (38366525).

91000195 is a wasteful number, since it uses less digits than its factorization.

91000195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 91000195 is about 9539.4022349411. The cubic root of 91000195 is about 449.7944658088.

The spelling of 91000195 in words is "ninety-one million, one hundred ninety-five", and thus it is an aban number.