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864641 is a prime number
BaseRepresentation
bin11010011000110000001
31121221001202
43103012001
5210132031
630310545
710230551
oct3230601
91557052
10864641
11540688
12358455
1324372b
14187161
151212cb
hexd3181

864641 has 2 divisors, whose sum is σ = 864642. Its totient is φ = 864640.

The previous prime is 864631. The next prime is 864673. The reversal of 864641 is 146468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863041 + 1600 = 929^2 + 40^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-864641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (864631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432320 + 432321.

It is an arithmetic number, because the mean of its divisors is an integer number (432321).

2864641 is an apocalyptic number.

It is an amenable number.

864641 is a deficient number, since it is larger than the sum of its proper divisors (1).

864641 is an equidigital number, since it uses as much as digits as its factorization.

864641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 864641 is about 929.8607422620. The cubic root of 864641 is about 95.2676110937.

The spelling of 864641 in words is "eight hundred sixty-four thousand, six hundred forty-one".