121646989 has 2 divisors, whose sum is σ = 121646990. Its totient is φ = 121646988.

The previous prime is 121646983. The next prime is 121647037. The reversal of 121646989 is 989646121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93450889 + 28196100 = 9667^2 + 5310^2 .

It is a cyclic number.

It is not a de Polignac number, because 121646989 - 2⁹ = 121646477 is a prime.

It is a super-2 number, since 2×121646989² = 29595979865532242, 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 (121646983) 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, 60823494 + 60823495.

It is an arithmetic number, because the mean of its divisors is an integer number (60823495).

Almost surely, 2^121646989 is an apocalyptic number.

It is an amenable number.

121646989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121646989 is an equidigital number, since it uses as much as digits as its factorization.

121646989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 121646989 is about 11029.3693836048. The cubic root of 121646989 is about 495.4887381135.

It can be divided in two parts, 1216 and 46989, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 121646989 in words is "one hundred twenty-one million, six hundred forty-six thousand, nine hundred eighty-nine".