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81100 = 2252811
BaseRepresentation
bin10011110011001100
311010020201
4103303030
510043400
61423244
7455305
oct236314
9133221
1081100
1155a28
123ab24
132abb6
14217ac
151906a
hex13ccc

81100 has 18 divisors (see below), whose sum is σ = 176204. Its totient is φ = 32400.

The previous prime is 81097. The next prime is 81101. The reversal of 81100 is 118.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a plaindrome in base 16.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (81101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 306 + ... + 505.

281100 is an apocalyptic number.

It is an amenable number.

81100 is an abundant number, since it is smaller than the sum of its proper divisors (95104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81100 is a wasteful number, since it uses less digits than its factorization.

81100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 81100 is about 284.7806173180. The cubic root of 81100 is about 43.2852853371.

Adding to 81100 its reverse (118), we get a palindrome (81218).

It can be divided in two parts, 81 and 100, that added together give a palindrome (181).

The spelling of 81100 in words is "eighty-one thousand, one hundred".

Divisors: 1 2 4 5 10 20 25 50 100 811 1622 3244 4055 8110 16220 20275 40550 81100