121601309 has 2 divisors, whose sum is σ = 121601310. Its totient is φ = 121601308.

The previous prime is 121601287. The next prime is 121601317. The reversal of 121601309 is 903106121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96098809 + 25502500 = 9803^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 121601309 - 2¹⁶ = 121535773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121601329) 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, 60800654 + 60800655.

It is an arithmetic number, because the mean of its divisors is an integer number (60800655).

Almost surely, 2^121601309 is an apocalyptic number.

It is an amenable number.

121601309 is a deficient number, since it is larger than the sum of its proper divisors (1).

121601309 is an equidigital number, since it uses as much as digits as its factorization.

121601309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 121601309 is about 11027.2983545382. The cubic root of 121601309 is about 495.4267095629.

The spelling of 121601309 in words is "one hundred twenty-one million, six hundred one thousand, three hundred nine".