8121959 has 2 divisors, whose sum is σ = 8121960. Its totient is φ = 8121958.

The previous prime is 8121947. The next prime is 8121973. The reversal of 8121959 is 9591218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8121959 - 2¹⁶ = 8056423 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121059) 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 as a sum of consecutive naturals, namely, 4060979 + 4060980.

It is an arithmetic number, because the mean of its divisors is an integer number (4060980).

Almost surely, 2^8121959 is an apocalyptic number.

8121959 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121959 is an equidigital number, since it uses as much as digits as its factorization.

8121959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 35.

The square root of 8121959 is about 2849.9050861388. The cubic root of 8121959 is about 201.0112037186.

The spelling of 8121959 in words is "eight million, one hundred twenty-one thousand, nine hundred fifty-nine".