8256121 has 4 divisors (see below), whose sum is σ = 8262144. Its totient is φ = 8250100.

The previous prime is 8256109. The next prime is 8256139. The reversal of 8256121 is 1216528.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8256121 - 2¹¹ = 8254073 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8256221) 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, 156 + ... + 4066.

It is an arithmetic number, because the mean of its divisors is an integer number (2065536).

Almost surely, 2^8256121 is an apocalyptic number.

It is an amenable number.

8256121 is a deficient number, since it is larger than the sum of its proper divisors (6023).

8256121 is a wasteful number, since it uses less digits than its factorization.

8256121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6022.

The product of its digits is 960, while the sum is 25.

The square root of 8256121 is about 2873.3466550349. The cubic root of 8256121 is about 202.1119612635. Note that the first 3 decimals are identical.

The spelling of 8256121 in words is "eight million, two hundred fifty-six thousand, one hundred twenty-one".