866461 has 2 divisors, whose sum is σ = 866462. Its totient is φ = 866460.

The previous prime is 866443. The next prime is 866471. The reversal of 866461 is 164668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 109561 = 870^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 866461 - 2¹³ = 858269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866431) 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, 433230 + 433231.

It is an arithmetic number, because the mean of its divisors is an integer number (433231).

2⁸⁶⁶⁴⁶¹ is an apocalyptic number.

It is an amenable number.

866461 is a deficient number, since it is larger than the sum of its proper divisors (1).

866461 is an equidigital number, since it uses as much as digits as its factorization.

866461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 866461 is about 930.8388689779. The cubic root of 866461 is about 95.3344078101.

The spelling of 866461 in words is "eight hundred sixty-six thousand, four hundred sixty-one".