7172015521 has 16 divisors (see below), whose sum is σ = 7873488000. Its totient is φ = 6478876800.

The previous prime is 7172015497. The next prime is 7172015533. The reversal of 7172015521 is 1255102717.

It is not a de Polignac number, because 7172015521 - 2⁵ = 7172015489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7172015551) 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, 2233365 + ... + 2236573.

It is an arithmetic number, because the mean of its divisors is an integer number (492093000).

Almost surely, 2^7172015521 is an apocalyptic number.

It is an amenable number.

7172015521 is a deficient number, since it is larger than the sum of its proper divisors (701472479).

7172015521 is a wasteful number, since it uses less digits than its factorization.

7172015521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4440.

The product of its (nonzero) digits is 4900, while the sum is 31.

The square root of 7172015521 is about 84687.7530756366. The cubic root of 7172015521 is about 1928.4737879113.

The spelling of 7172015521 in words is "seven billion, one hundred seventy-two million, fifteen thousand, five hundred twenty-one".