8621910543481 has 3 divisors (see below), whose sum is σ = 8621913479791. Its totient is φ = 8621907607172.

The previous prime is 8621910543443. The next prime is 8621910543503. The reversal of 8621910543481 is 1843450191268.

The square root of 8621910543481 is 2936309.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8203120363881 + 418790179600 = 2864109^2 + 647140^2 .

It is not a de Polignac number, because 8621910543481 - 2⁷ = 8621910543353 is a prime.

It is a super-2 number, since 2×8621910543481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8621910543401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1468155 + ... + 4404463.

Almost surely, 2^{8621910543481} is an apocalyptic number.

8621910543481 is the 2936309-th square number.

8621910543481 is the 1468155-th centered octagonal number.

It is an amenable number.

8621910543481 is a deficient number, since it is larger than the sum of its proper divisors (2936310).

8621910543481 is an frugal number, since it uses more digits than its factorization.

8621910543481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5872618 (or 2936309 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 8621910543481 in words is "eight trillion, six hundred twenty-one billion, nine hundred ten million, five hundred forty-three thousand, four hundred eighty-one".