81603 has 6 divisors (see below), whose sum is σ = 117884. Its totient is φ = 54396.
The previous prime is 81569. The next prime is 81611. The reversal of 81603 is 30618.
81603 is nontrivially palindromic in base 13.
It is not a de Polignac number, because 81603 - 216 = 16067 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (81203) 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, 4525 + ... + 4542.
281603 is an apocalyptic number.
81603 is a deficient number, since it is larger than the sum of its proper divisors (36281).
81603 is a wasteful number, since it uses less digits than its factorization.
81603 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9073 (or 9070 counting only the distinct ones).
The product of its (nonzero) digits is 144, while the sum is 18.
The square root of 81603 is about 285.6623881438. The cubic root of 81603 is about 43.3745892433.
The spelling of 81603 in words is "eighty-one thousand, six hundred three".
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