121826189 has 2 divisors, whose sum is σ = 121826190. Its totient is φ = 121826188.

The previous prime is 121826161. The next prime is 121826219. The reversal of 121826189 is 981628121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102860164 + 18966025 = 10142^2 + 4355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121826189 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (121826149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60913094 + 60913095.

It is an arithmetic number, because the mean of its divisors is an integer number (60913095).

Almost surely, 2^121826189 is an apocalyptic number.

It is an amenable number.

121826189 is a deficient number, since it is larger than the sum of its proper divisors (1).

121826189 is an equidigital number, since it uses as much as digits as its factorization.

121826189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 121826189 is about 11037.4901585460. The cubic root of 121826189 is about 495.7319226981.

The spelling of 121826189 in words is "one hundred twenty-one million, eight hundred twenty-six thousand, one hundred eighty-nine".