121944161 has 2 divisors, whose sum is σ = 121944162. Its totient is φ = 121944160.

The previous prime is 121944143. The next prime is 121944169. The reversal of 121944161 is 161449121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112678225 + 9265936 = 10615^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 121944161 - 2¹⁴ = 121927777 is a prime.

It is not a weakly prime, because it can be changed into another prime (121944169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60972080 + 60972081.

It is an arithmetic number, because the mean of its divisors is an integer number (60972081).

Almost surely, 2^121944161 is an apocalyptic number.

It is an amenable number.

121944161 is a deficient number, since it is larger than the sum of its proper divisors (1).

121944161 is an equidigital number, since it uses as much as digits as its factorization.

121944161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 121944161 is about 11042.8330151280. The cubic root of 121944161 is about 495.8918872607.

The spelling of 121944161 in words is "one hundred twenty-one million, nine hundred forty-four thousand, one hundred sixty-one".