871687 has 2 divisors, whose sum is σ = 871688. Its totient is φ = 871686.

The previous prime is 871681. The next prime is 871727. The reversal of 871687 is 786178.

It is a happy number.

871687 is nontrivially palindromic in base 9.

871687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 871687 - 2³ = 871679 is a prime.

It is an Ulam number.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435843 + 435844.

It is an arithmetic number, because the mean of its divisors is an integer number (435844).

2⁸⁷¹⁶⁸⁷ is an apocalyptic number.

871687 is a deficient number, since it is larger than the sum of its proper divisors (1).

871687 is an equidigital number, since it uses as much as digits as its factorization.

871687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 37.

The square root of 871687 is about 933.6417942659. The cubic root of 871687 is about 95.5256913966.

The spelling of 871687 in words is "eight hundred seventy-one thousand, six hundred eighty-seven".