897581 has 2 divisors, whose sum is σ = 897582. Its totient is φ = 897580.

The previous prime is 897577. The next prime is 897593. The reversal of 897581 is 185798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 885481 + 12100 = 941^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 897581 - 2² = 897577 is a prime.

It is a super-2 number, since 2×897581² = 1611303303122, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 897581.

It is not a weakly prime, because it can be changed into another prime (897571) 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, 448790 + 448791.

It is an arithmetic number, because the mean of its divisors is an integer number (448791).

2⁸⁹⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

897581 is a deficient number, since it is larger than the sum of its proper divisors (1).

897581 is an equidigital number, since it uses as much as digits as its factorization.

897581 is an odious number, because the sum of its binary digits is odd.

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

The square root of 897581 is about 947.4075152752. The cubic root of 897581 is about 96.4623601493.

The spelling of 897581 in words is "eight hundred ninety-seven thousand, five hundred eighty-one".