43128081 has 24 divisors (see below), whose sum is σ = 65988000. Its totient is φ = 27067392.

The previous prime is 43128077. The next prime is 43128083. The reversal of 43128081 is 18082134.

It is not a de Polignac number, because 43128081 - 2² = 43128077 is a prime.

It is a super-2 number, since 2×43128081² = 3720062741485122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43128083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29905 + ... + 31313.

It is an arithmetic number, because the mean of its divisors is an integer number (2749500).

Almost surely, 2^43128081 is an apocalyptic number.

It is an amenable number.

43128081 is a deficient number, since it is larger than the sum of its proper divisors (22859919).

43128081 is a wasteful number, since it uses less digits than its factorization.

43128081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613 (or 1610 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 43128081 is about 6567.1973474230. The cubic root of 43128081 is about 350.6873052175.

The spelling of 43128081 in words is "forty-three million, one hundred twenty-eight thousand, eighty-one".