91000193 has 2 divisors, whose sum is σ = 91000194. Its totient is φ = 91000192.

The previous prime is 91000187. The next prime is 91000207. The reversal of 91000193 is 39100019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60341824 + 30658369 = 7768^2 + 5537^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91000193 is a prime.

It is not a weakly prime, because it can be changed into another prime (91000163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500096 + 45500097.

It is an arithmetic number, because the mean of its divisors is an integer number (45500097).

Almost surely, 2^91000193 is an apocalyptic number.

It is an amenable number.

91000193 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000193 is an equidigital number, since it uses as much as digits as its factorization.

91000193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 91000193 is about 9539.4021301128. The cubic root of 91000193 is about 449.7944625137.

The spelling of 91000193 in words is "ninety-one million, one hundred ninety-three", and thus it is an aban number.