121947029 has 2 divisors, whose sum is σ = 121947030. Its totient is φ = 121947028.

The previous prime is 121946977. The next prime is 121947037. The reversal of 121947029 is 920749121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118222129 + 3724900 = 10873^2 + 1930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121947029 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121947029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121947829) 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, 60973514 + 60973515.

It is an arithmetic number, because the mean of its divisors is an integer number (60973515).

Almost surely, 2^121947029 is an apocalyptic number.

It is an amenable number.

121947029 is a deficient number, since it is larger than the sum of its proper divisors (1).

121947029 is an equidigital number, since it uses as much as digits as its factorization.

121947029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 121947029 is about 11042.9628723454. The cubic root of 121947029 is about 495.8957748509.

The spelling of 121947029 in words is "one hundred twenty-one million, nine hundred forty-seven thousand, twenty-nine".