121331239 has 2 divisors, whose sum is σ = 121331240. Its totient is φ = 121331238.

The previous prime is 121331213. The next prime is 121331267. The reversal of 121331239 is 932133121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121331239 - 2¹¹ = 121329191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121331269) 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, 60665619 + 60665620.

It is an arithmetic number, because the mean of its divisors is an integer number (60665620).

Almost surely, 2^121331239 is an apocalyptic number.

121331239 is a deficient number, since it is larger than the sum of its proper divisors (1).

121331239 is an equidigital number, since it uses as much as digits as its factorization.

121331239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 25.

The square root of 121331239 is about 11015.0460280473. The cubic root of 121331239 is about 495.0596656303.

The spelling of 121331239 in words is "one hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-nine".