81677 has 2 divisors, whose sum is σ = 81678. Its totient is φ = 81676.
The previous prime is 81671. The next prime is 81689. The reversal of 81677 is 77618.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 64516 + 17161 = 254^2 + 131^2 .
It is a cyclic number.
It is not a de Polignac number, because 81677 - 28 = 81421 is a prime.
It is a super-2 number, since 2×816772 = 13342264658, which contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (81671) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838 + 40839.
It is an arithmetic number, because the mean of its divisors is an integer number (40839).
281677 is an apocalyptic number.
It is an amenable number.
81677 is a deficient number, since it is larger than the sum of its proper divisors (1).
81677 is an equidigital number, since it uses as much as digits as its factorization.
81677 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2352, while the sum is 29.
The square root of 81677 is about 285.7918823200. The cubic root of 81677 is about 43.3876963998.
The spelling of 81677 in words is "eighty-one thousand, six hundred seventy-seven".
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