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3081 = 31379
BaseRepresentation
bin110000001001
311020010
4300021
544311
622133
711661
oct6011
94203
103081
112351
121949
131530
1411a1
15da6
hexc09

3081 has 8 divisors (see below), whose sum is σ = 4480. Its totient is φ = 1872.

The previous prime is 3079. The next prime is 3083. The reversal of 3081 is 1803.

3081 is a nontrivial binomial coefficient, being equal to C(79, 2).

It is an interprime number because it is at equal distance from previous prime (3079) and next prime (3083).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3081 - 21 = 3079 is a prime.

It is a super-2 number, since 2×30812 = 18985122, which contains 22 as substring.

It is the 56-th Hogben number.

It is a Duffinian number.

3081 is a modest number, since divided by 81 gives 3 as remainder.

It is a Curzon number.

It is a nialpdrome in base 5 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3083) by changing a digit.

It is a nontrivial repunit in base 55.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 78.

It is an arithmetic number, because the mean of its divisors is an integer number (560).

23081 is an apocalyptic number.

3081 is the 78-th triangular number.

It is an amenable number.

3081 is a deficient number, since it is larger than the sum of its proper divisors (1399).

3081 is a wasteful number, since it uses less digits than its factorization.

3081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 3081 is about 55.5067563455. The cubic root of 3081 is about 14.5511471563.

The spelling of 3081 in words is "three thousand, eighty-one".

Divisors: 1 3 13 39 79 237 1027 3081