Search a number
-
+
81147 = 3112459
BaseRepresentation
bin10011110011111011
311010022110
4103303323
510044042
61423403
7455403
oct236373
9133273
1081147
1155a70
123ab63
132ac21
1421803
151909c
hex13cfb

81147 has 8 divisors (see below), whose sum is σ = 118080. Its totient is φ = 49160.

The previous prime is 81131. The next prime is 81157. The reversal of 81147 is 74118.

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

It is a cyclic number.

It is not a de Polignac number, because 81147 - 24 = 81131 is a prime.

81147 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81147.

It is not an unprimeable number, because it can be changed into a prime (81157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1197 + ... + 1262.

It is an arithmetic number, because the mean of its divisors is an integer number (14760).

281147 is an apocalyptic number.

81147 is a deficient number, since it is larger than the sum of its proper divisors (36933).

81147 is a wasteful number, since it uses less digits than its factorization.

81147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473.

The product of its digits is 224, while the sum is 21.

The square root of 81147 is about 284.8631250267. The cubic root of 81147 is about 43.2936454503.

It can be divided in two parts, 811 and 47, that added together give a palindrome (858).

The spelling of 81147 in words is "eighty-one thousand, one hundred forty-seven".

Divisors: 1 3 11 33 2459 7377 27049 81147