487831 has 2 divisors, whose sum is σ = 487832. Its totient is φ = 487830.
The previous prime is 487829. The next prime is 487843. The reversal of 487831 is 138784.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 487831 - 21 = 487829 is a prime.
It is a super-2 number, since 2×4878312 = 475958169122, which contains 22 as substring.
Together with 487829, it forms a pair of twin primes.
It is a Chen prime.
It is a nialpdrome in base 15.
It is a junction number, because it is equal to n+sod(n) for n = 487793 and 487802.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (487811) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 243915 + 243916.
It is an arithmetic number, because the mean of its divisors is an integer number (243916).
2487831 is an apocalyptic number.
487831 is a deficient number, since it is larger than the sum of its proper divisors (1).
487831 is an equidigital number, since it uses as much as digits as its factorization.
487831 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5376, while the sum is 31.
The square root of 487831 is about 698.4489959904. The cubic root of 487831 is about 78.7208542517.
It can be divided in two parts, 48783 and 1, that added together give a palindrome (48784).
The spelling of 487831 in words is "four hundred eighty-seven thousand, eight hundred thirty-one".
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