43543881 has 6 divisors (see below), whose sum is σ = 62896730. Its totient is φ = 29029248.

The previous prime is 43543879. The next prime is 43543897. The reversal of 43543881 is 18834534.

It can be written as a sum of positive squares in only one way, i.e., 42575625 + 968256 = 6525^2 + 984^2 .

It is not a de Polignac number, because 43543881 - 2¹ = 43543879 is a prime.

It is a super-2 number, since 2×43543881² = 3792139145084322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43543811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2419096 + ... + 2419113.

Almost surely, 2^43543881 is an apocalyptic number.

It is an amenable number.

43543881 is a deficient number, since it is larger than the sum of its proper divisors (19352849).

43543881 is a wasteful number, since it uses less digits than its factorization.

43543881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4838215 (or 4838212 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 43543881 is about 6598.7787506477. The cubic root of 43543881 is about 351.8107006656.

The spelling of 43543881 in words is "forty-three million, five hundred forty-three thousand, eight hundred eighty-one".