7236531521 has 8 divisors (see below), whose sum is σ = 7434772200. Its totient is φ = 7038430848.

The previous prime is 7236531499. The next prime is 7236531563. The reversal of 7236531521 is 1251356327.

It can be written as a sum of positive squares in 4 ways, for example, as 4628897296 + 2607634225 = 68036^2 + 51065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7236531521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7236531571) 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 7 ways as a sum of consecutive naturals, for example, 74405 + ... + 141453.

It is an arithmetic number, because the mean of its divisors is an integer number (929346525).

Almost surely, 2^7236531521 is an apocalyptic number.

It is an amenable number.

7236531521 is a deficient number, since it is larger than the sum of its proper divisors (198240679).

7236531521 is a wasteful number, since it uses less digits than its factorization.

7236531521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70003.

The product of its digits is 37800, while the sum is 35.

The square root of 7236531521 is about 85067.8054319024. The cubic root of 7236531521 is about 1934.2390757600.

Adding to 7236531521 its reverse (1251356327), we get a palindrome (8487887848).

The spelling of 7236531521 in words is "seven billion, two hundred thirty-six million, five hundred thirty-one thousand, five hundred twenty-one".