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8065 = 51613
BaseRepresentation
bin1111110000001
3102001201
41332001
5224230
6101201
732341
oct17601
912051
108065
116072
124801
133895
142d21
1525ca
hex1f81

8065 has 4 divisors (see below), whose sum is σ = 9684. Its totient is φ = 6448.

The previous prime is 8059. The next prime is 8069. The reversal of 8065 is 5608.

8065 = 632 + 642.

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 3969 + 4096 = 63^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 8065 - 27 = 7937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 802 + ... + 811.

It is an arithmetic number, because the mean of its divisors is an integer number (2421).

It is a Proth number, since it is equal to 63 ⋅ 27 + 1 and 63 < 27.

28065 is an apocalyptic number.

8065 is the 64-th centered square number.

It is an amenable number.

8065 is a deficient number, since it is larger than the sum of its proper divisors (1619).

8065 is a wasteful number, since it uses less digits than its factorization.

8065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 8065 is about 89.8053450525. The cubic root of 8065 is about 20.0540206239.

The spelling of 8065 in words is "eight thousand, sixty-five".

Divisors: 1 5 1613 8065