8121697 has 2 divisors, whose sum is σ = 8121698. Its totient is φ = 8121696.

The previous prime is 8121689. The next prime is 8121709. The reversal of 8121697 is 7961218.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7834401 + 287296 = 2799^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 8121697 - 2³ = 8121689 is a prime.

8121697 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8121677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060848 + 4060849.

It is an arithmetic number, because the mean of its divisors is an integer number (4060849).

Almost surely, 2^8121697 is an apocalyptic number.

It is an amenable number.

8121697 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121697 is an equidigital number, since it uses as much as digits as its factorization.

8121697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 8121697 is about 2849.8591193250. The cubic root of 8121697 is about 201.0090422737.

The spelling of 8121697 in words is "eight million, one hundred twenty-one thousand, six hundred ninety-seven".