91073 has 4 divisors (see below), whose sum is σ = 92628. Its totient is φ = 89520.

The previous prime is 91033. The next prime is 91079. The reversal of 91073 is 37019.

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 37249 + 53824 = 193^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 91073 - 2⁶ = 91009 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91079) 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, 686 + ... + 807.

It is an arithmetic number, because the mean of its divisors is an integer number (23157).

2⁹¹⁰⁷³ is an apocalyptic number.

It is an amenable number.

91073 is a deficient number, since it is larger than the sum of its proper divisors (1555).

91073 is a wasteful number, since it uses less digits than its factorization.

91073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 189, while the sum is 20.

The square root of 91073 is about 301.7830346458. The cubic root of 91073 is about 44.9914387005.

It can be divided in two parts, 910 and 73, that multiplied together give a triangular number (66430 = T₃₆₄).

The spelling of 91073 in words is "ninety-one thousand, seventy-three".