91043201 has 4 divisors (see below), whose sum is σ = 91623252. Its totient is φ = 90463152.

The previous prime is 91043179. The next prime is 91043207. The reversal of 91043201 is 10234019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62410000 + 28633201 = 7900^2 + 5351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91043201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91043207) 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, 289790 + ... + 290103.

It is an arithmetic number, because the mean of its divisors is an integer number (22905813).

Almost surely, 2^91043201 is an apocalyptic number.

It is an amenable number.

91043201 is a deficient number, since it is larger than the sum of its proper divisors (580051).

91043201 is a wasteful number, since it uses less digits than its factorization.

91043201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580050.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 91043201 is about 9541.6560931528. The cubic root of 91043201 is about 449.8653111308.

The spelling of 91043201 in words is "ninety-one million, forty-three thousand, two hundred one".