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8149 = 29281
BaseRepresentation
bin1111111010101
3102011211
41333111
5230044
6101421
732521
oct17725
912154
108149
116139
124871
13392b
142d81
152634
hex1fd5

8149 has 4 divisors (see below), whose sum is σ = 8460. Its totient is φ = 7840.

The previous prime is 8147. The next prime is 8161. The reversal of 8149 is 9418.

It can be divided in two parts, 81 and 49, that multiplied together give a square (3969 = 632).

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 4900 + 3249 = 70^2 + 57^2 .

It is a cyclic number.

It is not a de Polignac number, because 8149 - 21 = 8147 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a deceptive number, since it divides R8148.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112 + ... + 169.

It is an arithmetic number, because the mean of its divisors is an integer number (2115).

28149 is an apocalyptic number.

It is an amenable number.

8149 is a deficient number, since it is larger than the sum of its proper divisors (311).

8149 is a wasteful number, since it uses less digits than its factorization.

8149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310.

The product of its digits is 288, while the sum is 22.

The square root of 8149 is about 90.2718117687. The cubic root of 8149 is about 20.1234036772.

The spelling of 8149 in words is "eight thousand, one hundred forty-nine".

Divisors: 1 29 281 8149