8117954521 has 4 divisors (see below), whose sum is σ = 8119349712. Its totient is φ = 8116559332.

The previous prime is 8117954519. The next prime is 8117954587. The reversal of 8117954521 is 1254597118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1254597118 = 2 ⋅627298559.

It is a cyclic number.

It is not a de Polignac number, because 8117954521 - 2¹ = 8117954519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8117954501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688831 + ... + 700516.

It is an arithmetic number, because the mean of its divisors is an integer number (2029837428).

Almost surely, 2^8117954521 is an apocalyptic number.

It is an amenable number.

8117954521 is a deficient number, since it is larger than the sum of its proper divisors (1395191).

8117954521 is a wasteful number, since it uses less digits than its factorization.

8117954521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395190.

The product of its digits is 100800, while the sum is 43.

The square root of 8117954521 is about 90099.6921248902. The cubic root of 8117954521 is about 2009.7816253273.

The spelling of 8117954521 in words is "eight billion, one hundred seventeen million, nine hundred fifty-four thousand, five hundred twenty-one".