8491973653 has 2 divisors, whose sum is σ = 8491973654. Its totient is φ = 8491973652.

The previous prime is 8491973627. The next prime is 8491973683. The reversal of 8491973653 is 3563791948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5319805969 + 3172167684 = 72937^2 + 56322^2 .

It is a cyclic number.

It is not a de Polignac number, because 8491973653 - 2⁵ = 8491973621 is a prime.

It is a super-2 number, since 2×8491973653² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8491973594 and 8491973603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8491973683) 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 as a sum of consecutive naturals, namely, 4245986826 + 4245986827.

It is an arithmetic number, because the mean of its divisors is an integer number (4245986827).

Almost surely, 2^8491973653 is an apocalyptic number.

It is an amenable number.

8491973653 is a deficient number, since it is larger than the sum of its proper divisors (1).

8491973653 is an equidigital number, since it uses as much as digits as its factorization.

8491973653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 55.

The square root of 8491973653 is about 92151.9053139977. The cubic root of 8491973653 is about 2040.1849804227.

The spelling of 8491973653 in words is "eight billion, four hundred ninety-one million, nine hundred seventy-three thousand, six hundred fifty-three".