43106209985 has 4 divisors (see below), whose sum is σ = 51727451988. Its totient is φ = 34484967984.

The previous prime is 43106209981. The next prime is 43106209997. The reversal of 43106209985 is 58990260134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21155120704 + 21951089281 = 145448^2 + 148159^2 .

It is a cyclic number.

It is not a de Polignac number, because 43106209985 - 2² = 43106209981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43106209981) 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, 4310620994 + ... + 4310621003.

It is an arithmetic number, because the mean of its divisors is an integer number (12931862997).

Almost surely, 2^43106209985 is an apocalyptic number.

It is an amenable number.

43106209985 is a deficient number, since it is larger than the sum of its proper divisors (8621242003).

43106209985 is an equidigital number, since it uses as much as digits as its factorization.

43106209985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8621242002.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 43106209985 in words is "forty-three billion, one hundred six million, two hundred nine thousand, nine hundred eighty-five".