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866641 is a prime number
BaseRepresentation
bin11010011100101010001
31122000210211
43103211101
5210213031
630324121
710236436
oct3234521
91560724
10866641
11542136
12359641
13244609
14187b8d
15121bb1
hexd3951

866641 has 2 divisors, whose sum is σ = 866642. Its totient is φ = 866640.

The previous prime is 866639. The next prime is 866653. The reversal of 866641 is 146668.

866641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863041 + 3600 = 929^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 866641 - 21 = 866639 is a prime.

Together with 866639, it forms a pair of twin primes.

866641 is a lucky number.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (866941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433320 + 433321.

It is an arithmetic number, because the mean of its divisors is an integer number (433321).

2866641 is an apocalyptic number.

It is an amenable number.

866641 is a deficient number, since it is larger than the sum of its proper divisors (1).

866641 is an equidigital number, since it uses as much as digits as its factorization.

866641 is an evil number, because the sum of its binary digits is even.

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

The square root of 866641 is about 930.9355509379. The cubic root of 866641 is about 95.3410089940.

The spelling of 866641 in words is "eight hundred sixty-six thousand, six hundred forty-one".