864491 has 2 divisors, whose sum is σ = 864492. Its totient is φ = 864490.

The previous prime is 864449. The next prime is 864503. The reversal of 864491 is 194468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864491 - 2⁶ = 864427 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (864091) 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, 432245 + 432246.

It is an arithmetic number, because the mean of its divisors is an integer number (432246).

2⁸⁶⁴⁴⁹¹ is an apocalyptic number.

864491 is a deficient number, since it is larger than the sum of its proper divisors (1).

864491 is an equidigital number, since it uses as much as digits as its factorization.

864491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 864491 is about 929.7800815247. The cubic root of 864491 is about 95.2621016903.

The spelling of 864491 in words is "eight hundred sixty-four thousand, four hundred ninety-one".