121945147 has 2 divisors, whose sum is σ = 121945148. Its totient is φ = 121945146.

The previous prime is 121945139. The next prime is 121945151. The reversal of 121945147 is 741549121.

It is a strong prime.

It is an emirp because it is prime and its reverse (741549121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121945147 - 2³ = 121945139 is a prime.

It is not a weakly prime, because it can be changed into another prime (121945247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60972573 + 60972574.

It is an arithmetic number, because the mean of its divisors is an integer number (60972574).

Almost surely, 2^121945147 is an apocalyptic number.

121945147 is a deficient number, since it is larger than the sum of its proper divisors (1).

121945147 is an equidigital number, since it uses as much as digits as its factorization.

121945147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 121945147 is about 11042.8776593785. The cubic root of 121945147 is about 495.8932237961.

The spelling of 121945147 in words is "one hundred twenty-one million, nine hundred forty-five thousand, one hundred forty-seven".