121943609 has 2 divisors, whose sum is σ = 121943610. Its totient is φ = 121943608.

The previous prime is 121943599. The next prime is 121943623. The reversal of 121943609 is 906349121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88303609 + 33640000 = 9397^2 + 5800^2 .

It is a cyclic number.

It is not a de Polignac number, because 121943609 - 2²⁴ = 105166393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121943639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60971804 + 60971805.

It is an arithmetic number, because the mean of its divisors is an integer number (60971805).

Almost surely, 2^121943609 is an apocalyptic number.

It is an amenable number.

121943609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121943609 is an equidigital number, since it uses as much as digits as its factorization.

121943609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 121943609 is about 11042.8080215134. The cubic root of 121943609 is about 495.8911390146.

The spelling of 121943609 in words is "one hundred twenty-one million, nine hundred forty-three thousand, six hundred nine".