815897 has 2 divisors, whose sum is σ = 815898. Its totient is φ = 815896.

The previous prime is 815891. The next prime is 815923. The reversal of 815897 is 798518.

815897 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., 811801 + 4096 = 901^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 815897 - 2¹⁰ = 814873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815897.

It is not a weakly prime, because it can be changed into another prime (815891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407948 + 407949.

It is an arithmetic number, because the mean of its divisors is an integer number (407949).

2⁸¹⁵⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

815897 is a deficient number, since it is larger than the sum of its proper divisors (1).

815897 is an equidigital number, since it uses as much as digits as its factorization.

815897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 38.

The square root of 815897 is about 903.2701699935. The cubic root of 815897 is about 93.4426426218.

The spelling of 815897 in words is "eight hundred fifteen thousand, eight hundred ninety-seven".