891487 has 2 divisors, whose sum is σ = 891488. Its totient is φ = 891486.

The previous prime is 891481. The next prime is 891491. The reversal of 891487 is 784198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891487 - 2¹¹ = 889439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445743 + 445744.

It is an arithmetic number, because the mean of its divisors is an integer number (445744).

2⁸⁹¹⁴⁸⁷ is an apocalyptic number.

891487 is a deficient number, since it is larger than the sum of its proper divisors (1).

891487 is an equidigital number, since it uses as much as digits as its factorization.

891487 is an odious number, because the sum of its binary digits is odd.

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

The square root of 891487 is about 944.1858927139. The cubic root of 891487 is about 96.2435583478.

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

The spelling of 891487 in words is "eight hundred ninety-one thousand, four hundred eighty-seven".