121989149 has 2 divisors, whose sum is σ = 121989150. Its totient is φ = 121989148.

The previous prime is 121989143. The next prime is 121989163. The reversal of 121989149 is 941989121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78889924 + 43099225 = 8882^2 + 6565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121989149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121989143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60994574 + 60994575.

It is an arithmetic number, because the mean of its divisors is an integer number (60994575).

Almost surely, 2^121989149 is an apocalyptic number.

It is an amenable number.

121989149 is a deficient number, since it is larger than the sum of its proper divisors (1).

121989149 is an equidigital number, since it uses as much as digits as its factorization.

121989149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 44.

The square root of 121989149 is about 11044.8698045744. The cubic root of 121989149 is about 495.9528617295.

The spelling of 121989149 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, one hundred forty-nine".