121886189 has 2 divisors, whose sum is σ = 121886190. Its totient is φ = 121886188.

The previous prime is 121886173. The next prime is 121886213. The reversal of 121886189 is 981688121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119137225 + 2748964 = 10915^2 + 1658^2 .

It is a cyclic number.

It is not a de Polignac number, because 121886189 - 2⁴ = 121886173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121886489) 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, 60943094 + 60943095.

It is an arithmetic number, because the mean of its divisors is an integer number (60943095).

Almost surely, 2^121886189 is an apocalyptic number.

It is an amenable number.

121886189 is a deficient number, since it is larger than the sum of its proper divisors (1).

121886189 is an equidigital number, since it uses as much as digits as its factorization.

121886189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 44.

The square root of 121886189 is about 11040.2078331886. The cubic root of 121886189 is about 495.8132928149.

The spelling of 121886189 in words is "one hundred twenty-one million, eight hundred eighty-six thousand, one hundred eighty-nine".