487891 has 2 divisors, whose sum is σ = 487892. Its totient is φ = 487890.

The previous prime is 487889. The next prime is 487897. The reversal of 487891 is 198784.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 487891 - 2¹ = 487889 is a prime.

Together with 487889, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 487891.

It is not a weakly prime, because it can be changed into another prime (487897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 243945 + 243946.

It is an arithmetic number, because the mean of its divisors is an integer number (243946).

2⁴⁸⁷⁸⁹¹ is an apocalyptic number.

487891 is a deficient number, since it is larger than the sum of its proper divisors (1).

487891 is an equidigital number, since it uses as much as digits as its factorization.

487891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 487891 is about 698.4919469829. The cubic root of 487891 is about 78.7240815016.

It can be divided in two parts, 487 and 891, that added together give a triangular number (1378 = T₅₂).

The spelling of 487891 in words is "four hundred eighty-seven thousand, eight hundred ninety-one".