8489947831 has 4 divisors (see below), whose sum is σ = 8533937392. Its totient is φ = 8445958272.

The previous prime is 8489947801. The next prime is 8489947903. The reversal of 8489947831 is 1387499848.

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

It is a cyclic number.

It is not a de Polignac number, because 8489947831 - 2²³ = 8481559223 is a prime.

It is a super-2 number, since 2×8489947831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8489947831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8489947801) 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, 21994491 + ... + 21994876.

It is an arithmetic number, because the mean of its divisors is an integer number (2133484348).

Almost surely, 2^8489947831 is an apocalyptic number.

8489947831 is a deficient number, since it is larger than the sum of its proper divisors (43989561).

8489947831 is a wasteful number, since it uses less digits than its factorization.

8489947831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43989560.

The product of its digits is 13934592, while the sum is 61.

The square root of 8489947831 is about 92140.9129051802. The cubic root of 8489947831 is about 2040.0227338713.

The spelling of 8489947831 in words is "eight billion, four hundred eighty-nine million, nine hundred forty-seven thousand, eight hundred thirty-one".