91000201 has 4 divisors (see below), whose sum is σ = 96353172. Its totient is φ = 85647232.

The previous prime is 91000193. The next prime is 91000207. The reversal of 91000201 is 10200019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10200019 = 281 ⋅36299.

It can be written as a sum of positive squares in 2 ways, for example, as 74839801 + 16160400 = 8651^2 + 4020^2 .

It is a cyclic number.

It is not a de Polignac number, because 91000201 - 2³ = 91000193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91000207) 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 3 ways as a sum of consecutive naturals, for example, 2676460 + ... + 2676493.

It is an arithmetic number, because the mean of its divisors is an integer number (24088293).

Almost surely, 2^91000201 is an apocalyptic number.

It is an amenable number.

91000201 is a deficient number, since it is larger than the sum of its proper divisors (5352971).

91000201 is a wasteful number, since it uses less digits than its factorization.

91000201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352970.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 91000201 is about 9539.4025494262. The cubic root of 91000201 is about 449.7944756944.

The spelling of 91000201 in words is "ninety-one million, two hundred one", and thus it is an aban number.