897817 has 2 divisors, whose sum is σ = 897818. Its totient is φ = 897816.

The previous prime is 897781. The next prime is 897829. The reversal of 897817 is 718798.

Together with previous prime (897781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 746496 + 151321 = 864^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 897817 - 2¹⁵ = 865049 is a prime.

897817 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 897817.

It is not a weakly prime, because it can be changed into another prime (897847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448908 + 448909.

It is an arithmetic number, because the mean of its divisors is an integer number (448909).

2⁸⁹⁷⁸¹⁷ is an apocalyptic number.

It is an amenable number.

897817 is a deficient number, since it is larger than the sum of its proper divisors (1).

897817 is an equidigital number, since it uses as much as digits as its factorization.

897817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 897817 is about 947.5320575052. The cubic root of 897817 is about 96.4708136564.

The spelling of 897817 in words is "eight hundred ninety-seven thousand, eight hundred seventeen".