8121289 has 8 divisors (see below), whose sum is σ = 8910720. Its totient is φ = 7340400.

The previous prime is 8121283. The next prime is 8121293. The reversal of 8121289 is 9821218.

It is a happy number.

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-8121289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8121289.

It is not an unprimeable number, because it can be changed into a prime (8121283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49 + ... + 4030.

It is an arithmetic number, because the mean of its divisors is an integer number (1113840).

Almost surely, 2^8121289 is an apocalyptic number.

It is an amenable number.

8121289 is a deficient number, since it is larger than the sum of its proper divisors (789431).

8121289 is a wasteful number, since it uses less digits than its factorization.

8121289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271.

The product of its digits is 2304, while the sum is 31.

The square root of 8121289 is about 2849.7875359402. The cubic root of 8121289 is about 201.0056762669.

The spelling of 8121289 in words is "eight million, one hundred twenty-one thousand, two hundred eighty-nine".