43370081 has 4 divisors (see below), whose sum is σ = 43559700. Its totient is φ = 43180464.

The previous prime is 43370071. The next prime is 43370083. The reversal of 43370081 is 18007334.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18007334 = 2 ⋅9003667.

It can be written as a sum of positive squares in 2 ways, for example, as 39891856 + 3478225 = 6316^2 + 1865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43370081 is a prime.

It is a super-2 number, since 2×43370081² = 3761927851893122, which contains 22 as substring.

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 43370081.

It is not an unprimeable number, because it can be changed into a prime (43370083) 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, 94466 + ... + 94923.

It is an arithmetic number, because the mean of its divisors is an integer number (10889925).

Almost surely, 2^43370081 is an apocalyptic number.

It is an amenable number.

43370081 is a deficient number, since it is larger than the sum of its proper divisors (189619).

43370081 is a wasteful number, since it uses less digits than its factorization.

43370081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189618.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 43370081 is about 6585.5964801983. The cubic root of 43370081 is about 351.3420069423.

The spelling of 43370081 in words is "forty-three million, three hundred seventy thousand, eighty-one".