91121 has 2 divisors, whose sum is σ = 91122. Its totient is φ = 91120.

The previous prime is 91099. The next prime is 91127. The reversal of 91121 is 12119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87025 + 4096 = 295^2 + 64^2 .

It is an emirp because it is prime and its reverse (12119) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91096 and 91105.

It is not a weakly prime, because it can be changed into another prime (91127) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45560 + 45561.

It is an arithmetic number, because the mean of its divisors is an integer number (45561).

2⁹¹¹²¹ is an apocalyptic number.

It is an amenable number.

91121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91121 is an equidigital number, since it uses as much as digits as its factorization.

91121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 14.

The square root of 91121 is about 301.8625515032. The cubic root of 91121 is about 44.9993415542. Note that the first 3 decimals are identical.

It can be divided in two parts, 91 and 121, that multiplied together give a palindrome (11011).

The spelling of 91121 in words is "ninety-one thousand, one hundred twenty-one".