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81111118 = 2114637963
BaseRepresentation
bin1001101010110…
…10100001001110
312122121212112111
410311122201032
5131231023433
612014254234
72003301364
oct465324116
9178555474
1081111118
114186aa90
12231b737a
1313a5c05a
14aab5634
1571c2dcd
hex4d5a84e

81111118 has 16 divisors (see below), whose sum is σ = 133030656. Its totient is φ = 36784440.

The previous prime is 81111101. The next prime is 81111119.

81111118 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

81111118 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81111119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6205 + ... + 14167.

It is an arithmetic number, because the mean of its divisors is an integer number (8314416).

Almost surely, 281111118 is an apocalyptic number.

81111118 is a deficient number, since it is larger than the sum of its proper divisors (51919538).

81111118 is a wasteful number, since it uses less digits than its factorization.

81111118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8439.

The product of its digits is 64, while the sum is 22.

The square root of 81111118 is about 9006.1711065247. The cubic root of 81111118 is about 432.8726324016.

It can be divided in two parts, 8111 and 1118, that added together give a palindrome (9229).

The spelling of 81111118 in words is "eighty-one million, one hundred eleven thousand, one hundred eighteen".

Divisors: 1 2 11 22 463 926 5093 7963 10186 15926 87593 175186 3686869 7373738 40555559 81111118