121544105 has 16 divisors (see below), whose sum is σ = 149155344. Its totient is φ = 95047680.

The previous prime is 121544099. The next prime is 121544123. The reversal of 121544105 is 501445121.

It can be written as a sum of positive squares in 8 ways, for example, as 7823209 + 113720896 = 2797^2 + 10664^2 .

It is not a de Polignac number, because 121544105 - 2⁶ = 121544041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88625 + ... + 89985.

It is an arithmetic number, because the mean of its divisors is an integer number (9322209).

Almost surely, 2^121544105 is an apocalyptic number.

It is an amenable number.

121544105 is a deficient number, since it is larger than the sum of its proper divisors (27611239).

121544105 is a wasteful number, since it uses less digits than its factorization.

121544105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 121544105 is about 11024.7043044247. The cubic root of 121544105 is about 495.3490107429.

Adding to 121544105 its reverse (501445121), we get a palindrome (622989226).

The spelling of 121544105 in words is "one hundred twenty-one million, five hundred forty-four thousand, one hundred five".