8187336521 has 16 divisors (see below), whose sum is σ = 10424198400. Its totient is φ = 6254515008.

The previous prime is 8187336517. The next prime is 8187336557. The reversal of 8187336521 is 1256337818.

It is a happy number.

It is not a de Polignac number, because 8187336521 - 2² = 8187336517 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (8187336581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1548581 + ... + 1553858.

It is an arithmetic number, because the mean of its divisors is an integer number (651512400).

Almost surely, 2^8187336521 is an apocalyptic number.

It is an amenable number.

8187336521 is a deficient number, since it is larger than the sum of its proper divisors (2236861879).

8187336521 is a wasteful number, since it uses less digits than its factorization.

8187336521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3102488.

The product of its digits is 241920, while the sum is 44.

The square root of 8187336521 is about 90483.9019991954. The cubic root of 8187336521 is about 2015.4910801800.

The spelling of 8187336521 in words is "eight billion, one hundred eighty-seven million, three hundred thirty-six thousand, five hundred twenty-one".