43078081 has 4 divisors (see below), whose sum is σ = 43214292. Its totient is φ = 42941872.

The previous prime is 43078069. The next prime is 43078097. The reversal of 43078081 is 18087034.

It is a happy number.

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 3186225 + 39891856 = 1785^2 + 6316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43078081 is a prime.

It is a super-2 number, since 2×43078081² = 3711442125285122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43078001) 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, 67630 + ... + 68263.

It is an arithmetic number, because the mean of its divisors is an integer number (10803573).

Almost surely, 2^43078081 is an apocalyptic number.

It is an amenable number.

43078081 is a deficient number, since it is larger than the sum of its proper divisors (136211).

43078081 is a wasteful number, since it uses less digits than its factorization.

43078081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136210.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 43078081 is about 6563.3894444867. The cubic root of 43078081 is about 350.5517311684.

The spelling of 43078081 in words is "forty-three million, seventy-eight thousand, eighty-one".