121749145 has 16 divisors (see below), whose sum is σ = 167182848. Its totient is φ = 83378880.

The previous prime is 121749119. The next prime is 121749149. The reversal of 121749145 is 541947121.

It is not a de Polignac number, because 121749145 - 2¹⁵ = 121716377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121749145.

It is not an unprimeable number, because it can be changed into a prime (121749149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34032 + ... + 37438.

It is an arithmetic number, because the mean of its divisors is an integer number (10448928).

Almost surely, 2^121749145 is an apocalyptic number.

It is an amenable number.

121749145 is a deficient number, since it is larger than the sum of its proper divisors (45433703).

121749145 is a wasteful number, since it uses less digits than its factorization.

121749145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4440.

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

The square root of 121749145 is about 11033.9995015407. Note that the first 3 decimals coincide. The cubic root of 121749145 is about 495.6273988552.

The spelling of 121749145 in words is "one hundred twenty-one million, seven hundred forty-nine thousand, one hundred forty-five".