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864221 is a prime number
BaseRepresentation
bin11010010111111011101
31121220111012
43102333131
5210123341
630305005
710226411
oct3227735
91556435
10864221
11540336
12358165
13243497
14186d41
151210eb
hexd2fdd

864221 has 2 divisors, whose sum is σ = 864222. Its totient is φ = 864220.

The previous prime is 864211. The next prime is 864223. The reversal of 864221 is 122468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 98596 = 875^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 864221 - 210 = 863197 is a prime.

Together with 864223, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

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 864221.

It is not a weakly prime, because it can be changed into another prime (864223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432110 + 432111.

It is an arithmetic number, because the mean of its divisors is an integer number (432111).

2864221 is an apocalyptic number.

It is an amenable number.

864221 is a deficient number, since it is larger than the sum of its proper divisors (1).

864221 is an equidigital number, since it uses as much as digits as its factorization.

864221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

The square root of 864221 is about 929.6348745610. The cubic root of 864221 is about 95.2521831580.

Adding to 864221 its reverse (122468), we get a palindrome (986689).

The spelling of 864221 in words is "eight hundred sixty-four thousand, two hundred twenty-one".