121520039 has 2 divisors, whose sum is σ = 121520040. Its totient is φ = 121520038.

The previous prime is 121520033. The next prime is 121520053. The reversal of 121520039 is 930025121.

It is a weak prime.

It is an emirp because it is prime and its reverse (930025121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121520039 - 2¹⁶ = 121454503 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 121519996 and 121520023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121520033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60760019 + 60760020.

It is an arithmetic number, because the mean of its divisors is an integer number (60760020).

Almost surely, 2^121520039 is an apocalyptic number.

121520039 is a deficient number, since it is larger than the sum of its proper divisors (1).

121520039 is an equidigital number, since it uses as much as digits as its factorization.

121520039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 121520039 is about 11023.6127925467. The cubic root of 121520039 is about 495.3163151872.

The spelling of 121520039 in words is "one hundred twenty-one million, five hundred twenty thousand, thirty-nine".