121658869 has 2 divisors, whose sum is σ = 121658870. Its totient is φ = 121658868.

The previous prime is 121658861. The next prime is 121658897. The reversal of 121658869 is 968856121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113678244 + 7980625 = 10662^2 + 2825^2 .

It is an emirp because it is prime and its reverse (968856121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121658869 - 2³ = 121658861 is a prime.

It is a super-2 number, since 2×121658869² = 29601760812718322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121658861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60829434 + 60829435.

It is an arithmetic number, because the mean of its divisors is an integer number (60829435).

Almost surely, 2^121658869 is an apocalyptic number.

It is an amenable number.

121658869 is a deficient number, since it is larger than the sum of its proper divisors (1).

121658869 is an equidigital number, since it uses as much as digits as its factorization.

121658869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The square root of 121658869 is about 11029.9079325260. The cubic root of 121658869 is about 495.5048673375.

The spelling of 121658869 in words is "one hundred twenty-one million, six hundred fifty-eight thousand, eight hundred sixty-nine".