891544487 has 4 divisors (see below), whose sum is σ = 891821976. Its totient is φ = 891267000.

The previous prime is 891544441. The next prime is 891544501. The reversal of 891544487 is 784445198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784445198 = 2 ⋅392222599.

It is a cyclic number.

It is not a de Polignac number, because 891544487 - 2¹⁴ = 891528103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891544427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133868 + ... + 140369.

It is an arithmetic number, because the mean of its divisors is an integer number (222955494).

Almost surely, 2^891544487 is an apocalyptic number.

891544487 is a deficient number, since it is larger than the sum of its proper divisors (277489).

891544487 is a wasteful number, since it uses less digits than its factorization.

891544487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277488.

The product of its digits is 1290240, while the sum is 50.

The square root of 891544487 is about 29858.7422206629. The cubic root of 891544487 is about 962.4562703920.

The spelling of 891544487 in words is "eight hundred ninety-one million, five hundred forty-four thousand, four hundred eighty-seven".