9817121 has 2 divisors, whose sum is σ = 9817122. Its totient is φ = 9817120.

The previous prime is 9817117. The next prime is 9817127. The reversal of 9817121 is 1217189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9388096 + 429025 = 3064^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 9817121 - 2² = 9817117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9817127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4908560 + 4908561.

It is an arithmetic number, because the mean of its divisors is an integer number (4908561).

Almost surely, 2^9817121 is an apocalyptic number.

It is an amenable number.

9817121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9817121 is an equidigital number, since it uses as much as digits as its factorization.

9817121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 29.

The square root of 9817121 is about 3133.2285266160. The cubic root of 9817121 is about 214.1220443976.

The spelling of 9817121 in words is "nine million, eight hundred seventeen thousand, one hundred twenty-one".