121729141 has 2 divisors, whose sum is σ = 121729142. Its totient is φ = 121729140.

The previous prime is 121729117. The next prime is 121729169. The reversal of 121729141 is 141927121.

It is an a-pointer prime, because the next prime (121729169) can be obtained adding 121729141 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62884900 + 58844241 = 7930^2 + 7671^2 .

It is a cyclic number.

It is not a de Polignac number, because 121729141 - 2⁵ = 121729109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121729241) 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, 60864570 + 60864571.

It is an arithmetic number, because the mean of its divisors is an integer number (60864571).

Almost surely, 2^121729141 is an apocalyptic number.

It is an amenable number.

121729141 is a deficient number, since it is larger than the sum of its proper divisors (1).

121729141 is an equidigital number, since it uses as much as digits as its factorization.

121729141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 28.

The square root of 121729141 is about 11033.0929933541. The cubic root of 121729141 is about 495.6002526727.

The spelling of 121729141 in words is "one hundred twenty-one million, seven hundred twenty-nine thousand, one hundred forty-one".