8749544521 has 9 divisors (see below), whose sum is σ = 8857386183. Its totient is φ = 8643003600.

The previous prime is 8749544519. The next prime is 8749544537. The reversal of 8749544521 is 1254459478.

The square root of 8749544521 is 93539.

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., 1680098121 + 7069446400 = 40989^2 + 84080^2 .

It is not a de Polignac number, because 8749544521 - 2¹ = 8749544519 is a prime.

It is a super-2 number, since 2×8749544521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8749344521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8324446 + ... + 8325496.

Almost surely, 2^8749544521 is an apocalyptic number.

8749544521 is the 93539-th square number.

8749544521 is the 46770-th centered octagonal number.

It is an amenable number.

8749544521 is a deficient number, since it is larger than the sum of its proper divisors (107841662).

8749544521 is an frugal number, since it uses more digits than its factorization.

8749544521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 1140 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 49.

The cubic root of 8749544521 is about 2060.6068938761.

Multiplying 8749544521 by its sum of digits (49), we get a square (428727681529 = 654773²).

The spelling of 8749544521 in words is "eight billion, seven hundred forty-nine million, five hundred forty-four thousand, five hundred twenty-one".