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81089318 = 240544659
BaseRepresentation
bin1001101010101…
…01001100100110
312122120202122002
410311111030212
5131224324233
612014005302
72003151002
oct465251446
9178522562
1081089318
1141855672
12231a6832
1313a5215b
14aaab702
1571bb6e8
hex4d55326

81089318 has 4 divisors (see below), whose sum is σ = 121633980. Its totient is φ = 40544658.

The previous prime is 81089317. The next prime is 81089347. The reversal of 81089318 is 81398018.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81089317) 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 as a sum of consecutive naturals, namely, 20272328 + ... + 20272331.

It is an arithmetic number, because the mean of its divisors is an integer number (30408495).

Almost surely, 281089318 is an apocalyptic number.

81089318 is a deficient number, since it is larger than the sum of its proper divisors (40544662).

81089318 is a wasteful number, since it uses less digits than its factorization.

81089318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40544661.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 81089318 is about 9004.9607439455. The cubic root of 81089318 is about 432.8338482860.

The spelling of 81089318 in words is "eighty-one million, eighty-nine thousand, three hundred eighteen".

Divisors: 1 2 40544659 81089318