8343543649 has 9 divisors (see below), whose sum is σ = 9706498707. Its totient is φ = 7151060784.

The previous prime is 8343543647. The next prime is 8343543721. The reversal of 8343543649 is 9463453438.

The square root of 8343543649 is 91343.

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

It can be written as a sum of positive squares in only one way, i.e., 4753137249 + 3590406400 = 68943^2 + 59920^2 .

It is not a de Polignac number, because 8343543649 - 2¹ = 8343543647 is a prime.

It is a super-2 number, since 2×8343543649² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8343543647) 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 in 8 ways as a sum of consecutive naturals, for example, 632877 + ... + 645925.

Almost surely, 2^8343543649 is an apocalyptic number.

8343543649 is the 91343-rd square number.

8343543649 is the 45672-nd centered octagonal number.

It is an amenable number.

8343543649 is a deficient number, since it is larger than the sum of its proper divisors (1362955058).

8343543649 is an frugal number, since it uses more digits than its factorization.

8343543649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26112 (or 13056 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 49.

The cubic root of 8343543649 is about 2028.2283432799.

Multiplying 8343543649 by its sum of digits (49), we get a square (408833638801 = 639401²).

8343543649 divided by its sum of digits (49) gives a square (170276401 = 13049²).

The spelling of 8343543649 in words is "eight billion, three hundred forty-three million, five hundred forty-three thousand, six hundred forty-nine".