8489753981 has 4 divisors (see below), whose sum is σ = 8989151292. Its totient is φ = 7990356672.

The previous prime is 8489753969. The next prime is 8489754017. The reversal of 8489753981 is 1893579848.

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 5323891225 + 3165862756 = 72965^2 + 56266^2 .

It is a cyclic number.

It is not a de Polignac number, because 8489753981 - 2⁶ = 8489753917 is a prime.

It is a super-2 number, since 2×8489753981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8489753911) 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, 249698630 + ... + 249698663.

It is an arithmetic number, because the mean of its divisors is an integer number (2247287823).

Almost surely, 2^8489753981 is an apocalyptic number.

It is an amenable number.

8489753981 is a deficient number, since it is larger than the sum of its proper divisors (499397311).

8489753981 is a wasteful number, since it uses less digits than its factorization.

8489753981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499397310.

The product of its digits is 17418240, while the sum is 62.

The square root of 8489753981 is about 92139.8609777549. The cubic root of 8489753981 is about 2040.0072072185.

The spelling of 8489753981 in words is "eight billion, four hundred eighty-nine million, seven hundred fifty-three thousand, nine hundred eighty-one".