43878125121 has 16 divisors (see below), whose sum is σ = 60398469120. Its totient is φ = 28305153360.

The previous prime is 43878125117. The next prime is 43878125129. The reversal of 43878125121 is 12152187834.

It is not a de Polignac number, because 43878125121 - 2² = 43878125117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43878125129) by changing a digit.

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, 959646 + ... + 1004328.

It is an arithmetic number, because the mean of its divisors is an integer number (3774904320).

Almost surely, 2^43878125121 is an apocalyptic number.

It is an amenable number.

43878125121 is a deficient number, since it is larger than the sum of its proper divisors (16520343999).

43878125121 is a wasteful number, since it uses less digits than its factorization.

43878125121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55276.

The product of its digits is 107520, while the sum is 42.

The spelling of 43878125121 in words is "forty-three billion, eight hundred seventy-eight million, one hundred twenty-five thousand, one hundred twenty-one".