121712329 has 2 divisors, whose sum is σ = 121712330. Its totient is φ = 121712328.

The previous prime is 121712321. The next prime is 121712359. The reversal of 121712329 is 923217121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 3337929 = 10880^2 + 1827^2 .

It is an emirp because it is prime and its reverse (923217121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121712329 - 2³ = 121712321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121712297 and 121712306.

It is not a weakly prime, because it can be changed into another prime (121712321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60856164 + 60856165.

It is an arithmetic number, because the mean of its divisors is an integer number (60856165).

Almost surely, 2^121712329 is an apocalyptic number.

It is an amenable number.

121712329 is a deficient number, since it is larger than the sum of its proper divisors (1).

121712329 is an equidigital number, since it uses as much as digits as its factorization.

121712329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 121712329 is about 11032.3310773381. The cubic root of 121712329 is about 495.5774358544.

The spelling of 121712329 in words is "one hundred twenty-one million, seven hundred twelve thousand, three hundred twenty-nine".