87751 has 2 divisors, whose sum is σ = 87752. Its totient is φ = 87750.
The previous prime is 87743. The next prime is 87767. The reversal of 87751 is 15778.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 87751 - 23 = 87743 is a prime.
It is a Chen prime.
87751 is a lucky number.
It is a nialpdrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (87701) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43875 + 43876.
It is an arithmetic number, because the mean of its divisors is an integer number (43876).
287751 is an apocalyptic number.
87751 is a deficient number, since it is larger than the sum of its proper divisors (1).
87751 is an equidigital number, since it uses as much as digits as its factorization.
87751 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1960, while the sum is 28.
The square root of 87751 is about 296.2279527661. The cubic root of 87751 is about 44.4376098287.
It can be divided in two parts, 87 and 751, that added together give a palindrome (838).
The spelling of 87751 in words is "eighty-seven thousand, seven hundred fifty-one".
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