91013 has 4 divisors (see below), whose sum is σ = 98028. Its totient is φ = 84000.

The previous prime is 91009. The next prime is 91019. The reversal of 91013 is 31019.

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 24964 + 66049 = 158^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 91013 - 2² = 91009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91019) 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, 3488 + ... + 3513.

It is an arithmetic number, because the mean of its divisors is an integer number (24507).

2⁹¹⁰¹³ is an apocalyptic number.

It is an amenable number.

91013 is a deficient number, since it is larger than the sum of its proper divisors (7015).

91013 is a wasteful number, since it uses less digits than its factorization.

91013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7014.

The product of its (nonzero) digits is 27, while the sum is 14.

The square root of 91013 is about 301.6836091007. The cubic root of 91013 is about 44.9815562276.

The spelling of 91013 in words is "ninety-one thousand, thirteen".