43590091 has 4 divisors (see below), whose sum is σ = 46154232. Its totient is φ = 41025952.

The previous prime is 43590073. The next prime is 43590097. The reversal of 43590091 is 19009534.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19009534 = 2 ⋅9504767.

It is a cyclic number.

It is not a de Polignac number, because 43590091 - 2⁵ = 43590059 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43590097) 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, 1282045 + ... + 1282078.

It is an arithmetic number, because the mean of its divisors is an integer number (11538558).

Almost surely, 2^43590091 is an apocalyptic number.

43590091 is a deficient number, since it is larger than the sum of its proper divisors (2564141).

43590091 is a wasteful number, since it uses less digits than its factorization.

43590091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564140.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 43590091 is about 6602.2792276607. The cubic root of 43590091 is about 351.9351071619.

The spelling of 43590091 in words is "forty-three million, five hundred ninety thousand, ninety-one".