121319839 has 2 divisors, whose sum is σ = 121319840. Its totient is φ = 121319838.

The previous prime is 121319827. The next prime is 121319843. The reversal of 121319839 is 938913121.

It is a strong prime.

It is an emirp because it is prime and its reverse (938913121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121319839 - 2⁷ = 121319711 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121319798 and 121319807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121319819) 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, 60659919 + 60659920.

It is an arithmetic number, because the mean of its divisors is an integer number (60659920).

Almost surely, 2^121319839 is an apocalyptic number.

121319839 is a deficient number, since it is larger than the sum of its proper divisors (1).

121319839 is an equidigital number, since it uses as much as digits as its factorization.

121319839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 121319839 is about 11014.5285418850. The cubic root of 121319839 is about 495.0441602612.

The spelling of 121319839 in words is "one hundred twenty-one million, three hundred nineteen thousand, eight hundred thirty-nine".