43811161 has 3 divisors (see below), whose sum is σ = 43817781. Its totient is φ = 43804542.

The previous prime is 43811147. The next prime is 43811177. The reversal of 43811161 is 16111834.

It is a happy number.

The square root of 43811161 is 6619.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16111834 = 2 ⋅8055917.

It is not a de Polignac number, because 43811161 - 2⁵ = 43811129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43811111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3310 + ... + 9928.

It is an arithmetic number, because the mean of its divisors is an integer number (14605927).

Almost surely, 2^43811161 is an apocalyptic number.

43811161 is the 6619-th square number.

43811161 is the 3310-th centered octagonal number.

It is an amenable number.

43811161 is a deficient number, since it is larger than the sum of its proper divisors (6620).

43811161 is an frugal number, since it uses more digits than its factorization.

43811161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13238 (or 6619 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The cubic root of 43811161 is about 352.5290581816.

Multiplying 43811161 by its sum of digits (25), we get a square (1095279025 = 33095²).

Multiplying 43811161 by its product of digits (576), we get a square (25235228736 = 158856²).

Adding to 43811161 its reverse (16111834), we get a palindrome (59922995).

The spelling of 43811161 in words is "forty-three million, eight hundred eleven thousand, one hundred sixty-one".