43161641 has 4 divisors (see below), whose sum is σ = 44553984. Its totient is φ = 41769300.

The previous prime is 43161631. The next prime is 43161649. The reversal of 43161641 is 14616134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43161641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43161641.

It is not an unprimeable number, because it can be changed into a prime (43161649) 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, 696125 + ... + 696186.

It is an arithmetic number, because the mean of its divisors is an integer number (11138496).

Almost surely, 2^43161641 is an apocalyptic number.

It is an amenable number.

43161641 is a deficient number, since it is larger than the sum of its proper divisors (1392343).

43161641 is a wasteful number, since it uses less digits than its factorization.

43161641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392342.

The product of its digits is 1728, while the sum is 26.

The square root of 43161641 is about 6569.7519740094. The cubic root of 43161641 is about 350.7782437609.

Adding to 43161641 its reverse (14616134), we get a palindrome (57777775).

The spelling of 43161641 in words is "forty-three million, one hundred sixty-one thousand, six hundred forty-one".