864511 has 2 divisors, whose sum is σ = 864512. Its totient is φ = 864510.

The previous prime is 864509. The next prime is 864533. The reversal of 864511 is 115468.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864511 - 2¹ = 864509 is a prime.

Together with 864509, it forms a pair of twin primes.

864511 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432255 + 432256.

It is an arithmetic number, because the mean of its divisors is an integer number (432256).

2⁸⁶⁴⁵¹¹ is an apocalyptic number.

864511 is a deficient number, since it is larger than the sum of its proper divisors (1).

864511 is an equidigital number, since it uses as much as digits as its factorization.

864511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 25.

The square root of 864511 is about 929.7908366939. The cubic root of 864511 is about 95.2628363142.

Adding to 864511 its reverse (115468), we get a palindrome (979979).

The spelling of 864511 in words is "eight hundred sixty-four thousand, five hundred eleven".