9121 has 4 divisors (see below), whose sum is σ = 10432. Its totient is φ = 7812.
The previous prime is 9109. The next prime is 9127. The reversal of 9121 is 1219.
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: 1219 = 23 ⋅53.
It is not a de Polignac number, because 9121 - 29 = 8609 is a prime.
It is the 96-th Hogben number.
It is a Duffinian number.
9121 is a lucky number.
It is a plaindrome in base 14.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9127) by changing a digit.
It is a nontrivial repunit in base 95.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645 + ... + 658.
It is an arithmetic number, because the mean of its divisors is an integer number (2608).
29121 is an apocalyptic number.
It is an amenable number.
9121 is a deficient number, since it is larger than the sum of its proper divisors (1311).
9121 is a wasteful number, since it uses less digits than its factorization.
9121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1310.
The product of its digits is 18, while the sum is 13.
The square root of 9121 is about 95.5039266208. The cubic root of 9121 is about 20.8936421371.
It can be divided in two parts, 9 and 121, that multiplied together give a square (1089 = 332).
The spelling of 9121 in words is "nine thousand, one hundred twenty-one".
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