7528081321 has 16 divisors (see below), whose sum is σ = 8153720064. Its totient is φ = 6923245824.

The previous prime is 7528081313. The next prime is 7528081331. The reversal of 7528081321 is 1231808257.

It is a cyclic number.

It is not a de Polignac number, because 7528081321 - 2³ = 7528081313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7528081331) 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 15 ways as a sum of consecutive naturals, for example, 506431 + ... + 521083.

It is an arithmetic number, because the mean of its divisors is an integer number (509607504).

Almost surely, 2^7528081321 is an apocalyptic number.

It is an amenable number.

7528081321 is a deficient number, since it is larger than the sum of its proper divisors (625638743).

7528081321 is a wasteful number, since it uses less digits than its factorization.

7528081321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15360.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 7528081321 is about 86764.5164857155. The cubic root of 7528081321 is about 1959.8737702442.

Adding to 7528081321 its reverse (1231808257), we get a palindrome (8759889578).

The spelling of 7528081321 in words is "seven billion, five hundred twenty-eight million, eighty-one thousand, three hundred twenty-one".