91201 has 4 divisors (see below), whose sum is σ = 99504. Its totient is φ = 82900.

The previous prime is 91199. The next prime is 91229. The reversal of 91201 is 10219.

91201 = T₁₆ + T₁₇ + ... + T₈₁.

91201 = 86² + 87² + ... + 96².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10219 = 11 ⋅929.

It is a cyclic number.

It is not a de Polignac number, because 91201 - 2¹ = 91199 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (91291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4135 + ... + 4156.

It is an arithmetic number, because the mean of its divisors is an integer number (24876).

2⁹¹²⁰¹ is an apocalyptic number.

It is an amenable number.

91201 is a deficient number, since it is larger than the sum of its proper divisors (8303).

91201 is a wasteful number, since it uses less digits than its factorization.

91201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8302.

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

The square root of 91201 is about 301.9950330717. The cubic root of 91201 is about 45.0125068117.

Adding to 91201 its product of nonzero digits (18), we get a palindrome (91219).

It can be divided in two parts, 91 and 201, that added together give a palindrome (292).

The spelling of 91201 in words is "ninety-one thousand, two hundred one".