8397121 has 2 divisors, whose sum is σ = 8397122. Its totient is φ = 8397120.

The previous prime is 8397119. The next prime is 8397131. The reversal of 8397121 is 1217938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7230721 + 1166400 = 2689^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 8397121 - 2¹ = 8397119 is a prime.

Together with 8397119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8397101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4198560 + 4198561.

It is an arithmetic number, because the mean of its divisors is an integer number (4198561).

Almost surely, 2^8397121 is an apocalyptic number.

It is an amenable number.

8397121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8397121 is an equidigital number, since it uses as much as digits as its factorization.

8397121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 8397121 is about 2897.7786319869. The cubic root of 8397121 is about 203.2560448591.

The spelling of 8397121 in words is "eight million, three hundred ninety-seven thousand, one hundred twenty-one".