8121317 has 4 divisors (see below), whose sum is σ = 8133216. Its totient is φ = 8109420.

The previous prime is 8121307. The next prime is 8121319. The reversal of 8121317 is 7131218.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 8121317 - 2¹⁴ = 8104933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8121292 and 8121301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121319) 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 3 ways as a sum of consecutive naturals, for example, 4859 + ... + 6312.

It is an arithmetic number, because the mean of its divisors is an integer number (2033304).

Almost surely, 2^8121317 is an apocalyptic number.

It is an amenable number.

8121317 is a deficient number, since it is larger than the sum of its proper divisors (11899).

8121317 is a wasteful number, since it uses less digits than its factorization.

8121317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11898.

The product of its digits is 336, while the sum is 23.

The square root of 8121317 is about 2849.7924485829. The cubic root of 8121317 is about 201.0059072709.

Subtracting from 8121317 its reverse (7131218), we obtain a palindrome (990099).

The spelling of 8121317 in words is "eight million, one hundred twenty-one thousand, three hundred seventeen".