43875687161 has 4 divisors (see below), whose sum is σ = 44368672500. Its totient is φ = 43382701824.

The previous prime is 43875687143. The next prime is 43875687169. The reversal of 43875687161 is 16178657834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16178657834 = 2 ⋅8089328917.

It can be written as a sum of positive squares in 2 ways, for example, as 5048955136 + 38826732025 = 71056^2 + 197045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43875687161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43875687097 and 43875687106.

It is not an unprimeable number, because it can be changed into a prime (43875687169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246492536 + ... + 246492713.

It is an arithmetic number, because the mean of its divisors is an integer number (11092168125).

Almost surely, 2^43875687161 is an apocalyptic number.

It is an amenable number.

43875687161 is a deficient number, since it is larger than the sum of its proper divisors (492985339).

43875687161 is an equidigital number, since it uses as much as digits as its factorization.

43875687161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492985338.

The product of its digits is 6773760, while the sum is 56.

The spelling of 43875687161 in words is "forty-three billion, eight hundred seventy-five million, six hundred eighty-seven thousand, one hundred sixty-one".