81755 has 8 divisors (see below), whose sum is σ = 99792. Its totient is φ = 64288.
The previous prime is 81749. The next prime is 81761. The reversal of 81755 is 55718.
It is an interprime number because it is at equal distance from previous prime (81749) and next prime (81761).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 81755 - 212 = 77659 is a prime.
It is a Duffinian number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317 + ... + 513.
It is an arithmetic number, because the mean of its divisors is an integer number (12474).
281755 is an apocalyptic number.
81755 is a deficient number, since it is larger than the sum of its proper divisors (18037).
81755 is a wasteful number, since it uses less digits than its factorization.
81755 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 285.
The product of its digits is 1400, while the sum is 26.
The square root of 81755 is about 285.9283126939. The cubic root of 81755 is about 43.4015034838.
The spelling of 81755 in words is "eighty-one thousand, seven hundred fifty-five".
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