43540161 has 16 divisors (see below), whose sum is σ = 66444288. Its totient is φ = 24843600.

The previous prime is 43540141. The next prime is 43540163. The reversal of 43540161 is 16104534.

It is not a de Polignac number, because 43540161 - 2⁷ = 43540033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43540163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20646 + ... + 22656.

It is an arithmetic number, because the mean of its divisors is an integer number (4152768).

Almost surely, 2^43540161 is an apocalyptic number.

It is an amenable number.

43540161 is a deficient number, since it is larger than the sum of its proper divisors (22904127).

43540161 is a wasteful number, since it uses less digits than its factorization.

43540161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 43540161 is about 6598.4968742889. The cubic root of 43540161 is about 351.8006818597.

Adding to 43540161 its reverse (16104534), we get a palindrome (59644695).

The spelling of 43540161 in words is "forty-three million, five hundred forty thousand, one hundred sixty-one".