817897 has 2 divisors, whose sum is σ = 817898. Its totient is φ = 817896.

The previous prime is 817891. The next prime is 817907. The reversal of 817897 is 798718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609961 + 207936 = 781^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 817897 - 2³ = 817889 is a prime.

It is not a weakly prime, because it can be changed into another prime (817891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408948 + 408949.

It is an arithmetic number, because the mean of its divisors is an integer number (408949).

2⁸¹⁷⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

817897 is a deficient number, since it is larger than the sum of its proper divisors (1).

817897 is an equidigital number, since it uses as much as digits as its factorization.

817897 is an evil number, because the sum of its binary digits is even.

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

The square root of 817897 is about 904.3765808556. The cubic root of 817897 is about 93.5189319857.

It can be divided in two parts, 81789 and 7, that added together give a square (81796 = 286²).

The spelling of 817897 in words is "eight hundred seventeen thousand, eight hundred ninety-seven".