91901 has 4 divisors (see below), whose sum is σ = 95100. Its totient is φ = 88704.

The previous prime is 91873. The next prime is 91909. The reversal of 91901 is 10919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10919 = 61 ⋅179.

It can be written as a sum of positive squares in 2 ways, for example, as 63001 + 28900 = 251^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 91901 - 2⁶ = 91837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91909) 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, 1556 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (23775).

2⁹¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

91901 is a deficient number, since it is larger than the sum of its proper divisors (3199).

91901 is a wasteful number, since it uses less digits than its factorization.

91901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 91901 is about 303.1517771678. The cubic root of 91901 is about 45.1273757391.

The spelling of 91901 in words is "ninety-one thousand, nine hundred one".