7475504521 has 3 divisors (see below), whose sum is σ = 7475590983. Its totient is φ = 7475418060.

The previous prime is 7475504507. The next prime is 7475504567. The reversal of 7475504521 is 1254055747.

The square root of 7475504521 is 86461.

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., 7466860921 + 8643600 = 86411^2 + 2940^2 .

It is not a de Polignac number, because 7475504521 - 2¹¹ = 7475502473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7475504501) 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 2 ways as a sum of consecutive naturals, for example, 43231 + ... + 129691.

It is an arithmetic number, because the mean of its divisors is an integer number (2491863661).

Almost surely, 2^7475504521 is an apocalyptic number.

7475504521 is the 86461-st square number.

7475504521 is the 43231-st centered octagonal number.

It is an amenable number.

7475504521 is a deficient number, since it is larger than the sum of its proper divisors (86462).

7475504521 is an frugal number, since it uses more digits than its factorization.

7475504521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172922 (or 86461 counting only the distinct ones).

The product of its (nonzero) digits is 196000, while the sum is 40.

The cubic root of 7475504521 is about 1955.3004617096.

The spelling of 7475504521 in words is "seven billion, four hundred seventy-five million, five hundred four thousand, five hundred twenty-one".