121644159 has 16 divisors (see below), whose sum is σ = 199621632. Its totient is φ = 64163808.

The previous prime is 121644157. The next prime is 121644167. The reversal of 121644159 is 951446121.

It is not a de Polignac number, because 121644159 - 2¹ = 121644157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121644157) 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 in 15 ways as a sum of consecutive naturals, for example, 222519 + ... + 223064.

It is an arithmetic number, because the mean of its divisors is an integer number (12476352).

Almost surely, 2^121644159 is an apocalyptic number.

121644159 is a deficient number, since it is larger than the sum of its proper divisors (77977473).

121644159 is a wasteful number, since it uses less digits than its factorization.

121644159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445606.

The product of its digits is 8640, while the sum is 33.

The square root of 121644159 is about 11029.2410890324. The cubic root of 121644159 is about 495.4848957277.

The spelling of 121644159 in words is "one hundred twenty-one million, six hundred forty-four thousand, one hundred fifty-nine".