871813489 has 4 divisors (see below), whose sum is σ = 872090740. Its totient is φ = 871536240.

The previous prime is 871813451. The next prime is 871813507. The reversal of 871813489 is 984318178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 325189089 + 546624400 = 18033^2 + 23380^2 .

It is a cyclic number.

It is not a de Polignac number, because 871813489 - 2⁷ = 871813361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871813409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133854 + ... + 140215.

It is an arithmetic number, because the mean of its divisors is an integer number (218022685).

Almost surely, 2^871813489 is an apocalyptic number.

It is an amenable number.

871813489 is a deficient number, since it is larger than the sum of its proper divisors (277251).

871813489 is a wasteful number, since it uses less digits than its factorization.

871813489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277250.

The product of its digits is 387072, while the sum is 49.

The square root of 871813489 is about 29526.4879218643. The cubic root of 871813489 is about 955.3031169600.

The spelling of 871813489 in words is "eight hundred seventy-one million, eight hundred thirteen thousand, four hundred eighty-nine".