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2081665 = 5416333
BaseRepresentation
bin111111100001110000001
310220202111201
413330032001
51013103130
6112341201
723456665
oct7741601
93822451
102081665
1111a1a93
12844801
1357b671
143c28a5
152b1bca
hex1fc381

2081665 has 4 divisors (see below), whose sum is σ = 2498004. Its totient is φ = 1665328.

The previous prime is 2081647. The next prime is 2081671. The reversal of 2081665 is 5661802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 651249 + 1430416 = 807^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081665 - 27 = 2081537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 208162 + ... + 208171.

It is an arithmetic number, because the mean of its divisors is an integer number (624501).

22081665 is an apocalyptic number.

It is an amenable number.

2081665 is a deficient number, since it is larger than the sum of its proper divisors (416339).

2081665 is an equidigital number, since it uses as much as digits as its factorization.

2081665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416338.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2081665 is about 1442.7976296071. The cubic root of 2081665 is about 127.6841373727.

The spelling of 2081665 in words is "two million, eighty-one thousand, six hundred sixty-five".

Divisors: 1 5 416333 2081665