43145091 has 18 divisors (see below), whose sum is σ = 68502980. Its totient is φ = 26147880.

The previous prime is 43145057. The next prime is 43145093. The reversal of 43145091 is 19054134.

It is not a de Polignac number, because 43145091 - 2⁹ = 43144579 is a prime.

It is a super-2 number, since 2×43145091² = 3722997754796562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43145093) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18721 + ... + 20898.

Almost surely, 2^43145091 is an apocalyptic number.

43145091 is a deficient number, since it is larger than the sum of its proper divisors (25357889).

43145091 is a wasteful number, since it uses less digits than its factorization.

43145091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39647 (or 39633 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 43145091 is about 6568.4922927564. The cubic root of 43145091 is about 350.7334036207.

The spelling of 43145091 in words is "forty-three million, one hundred forty-five thousand, ninety-one".