81142 has 8 divisors (see below), whose sum is σ = 126000. Its totient is φ = 39144.
The previous prime is 81131. The next prime is 81157. The reversal of 81142 is 24118.
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a congruent number.
It is an unprimeable number.
81142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642 + ... + 757.
It is an arithmetic number, because the mean of its divisors is an integer number (15750).
281142 is an apocalyptic number.
81142 is a deficient number, since it is larger than the sum of its proper divisors (44858).
81142 is a wasteful number, since it uses less digits than its factorization.
81142 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1430.
The product of its digits is 64, while the sum is 16.
The square root of 81142 is about 284.8543487469. The cubic root of 81142 is about 43.2927562300.
The spelling of 81142 in words is "eighty-one thousand, one hundred forty-two".
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