91003 has 4 divisors (see below), whose sum is σ = 99288. Its totient is φ = 82720.

The previous prime is 90997. The next prime is 91009. The reversal of 91003 is 30019.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30019 = 11 ⋅2729.

It is an interprime number because it is at equal distance from previous prime (90997) and next prime (91009).

It is not a de Polignac number, because 91003 - 2⁵ = 90971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4126 + ... + 4147.

It is an arithmetic number, because the mean of its divisors is an integer number (24822).

2⁹¹⁰⁰³ is an apocalyptic number.

91003 is a deficient number, since it is larger than the sum of its proper divisors (8285).

91003 is a wasteful number, since it uses less digits than its factorization.

91003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 91003 is about 301.6670349906. The cubic root of 91003 is about 44.9799087266.

The spelling of 91003 in words is "ninety-one thousand, three".