121840259 has 2 divisors, whose sum is σ = 121840260. Its totient is φ = 121840258.

The previous prime is 121840253. The next prime is 121840283. The reversal of 121840259 is 952048121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121840259 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_6940418 and since 121840259 and 6940418 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (121840253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60920129 + 60920130.

It is an arithmetic number, because the mean of its divisors is an integer number (60920130).

Almost surely, 2^121840259 is an apocalyptic number.

121840259 is a deficient number, since it is larger than the sum of its proper divisors (1).

121840259 is an equidigital number, since it uses as much as digits as its factorization.

121840259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 121840259 is about 11038.1275133059. The cubic root of 121840259 is about 495.7510063880.

The spelling of 121840259 in words is "one hundred twenty-one million, eight hundred forty thousand, two hundred fifty-nine".