43145 has 4 divisors (see below), whose sum is σ = 51780. Its totient is φ = 34512.

The previous prime is 43133. The next prime is 43151. The reversal of 43145 is 54134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54134 = 2 ⋅27067.

It can be written as a sum of positive squares in 2 ways, for example, as 24649 + 18496 = 157^2 + 136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43145 is a prime.

It is a super-2 number, since 2×43145² = 3722982050, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4310 + ... + 4319.

It is an arithmetic number, because the mean of its divisors is an integer number (12945).

2⁴³¹⁴⁵ is an apocalyptic number.

It is an amenable number.

43145 is a deficient number, since it is larger than the sum of its proper divisors (8635).

43145 is an equidigital number, since it uses as much as digits as its factorization.

43145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8634.

The product of its digits is 240, while the sum is 17.

The square root of 43145 is about 207.7137453324. The cubic root of 43145 is about 35.0733157036.

Adding to 43145 its reverse (54134), we get a palindrome (97279).

The spelling of 43145 in words is "forty-three thousand, one hundred forty-five".