997897 has 2 divisors, whose sum is σ = 997898.
Its totient is φ = 997896.
The previous prime is 997891. The next prime is 997933. The reversal of 997897 is 798799.
997897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 876096 + 121801 = 936^2 + 349^2
It is an emirp because it is prime and its reverse (798799) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 997897 - 23 = 997889 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 997897.
It is not a weakly prime, because it can be changed into another prime (997891) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498948 + 498949.
It is an arithmetic number, because the mean of its divisors is an integer number (498949).
2997897 is an apocalyptic number.
It is an amenable number.
997897 is a deficient number, since it is larger than the sum of its proper divisors (1).
997897 is an equidigital number, since it uses as much as digits as its factorization.
997897 is an evil number, because the sum of its binary digits is even.
The product of its digits is 285768, while the sum is 49.
The square root of 997897 is about 998.9479465918.
The cubic root of 997897 is about 99.9298508024.
The spelling of 997897 in words is "nine hundred ninety-seven thousand, eight hundred ninety-seven".