43408591 has 2 divisors, whose sum is σ = 43408592. Its totient is φ = 43408590.

The previous prime is 43408583. The next prime is 43408609. The reversal of 43408591 is 19580434.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43408591 - 2³ = 43408583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43408571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21704295 + 21704296.

It is an arithmetic number, because the mean of its divisors is an integer number (21704296).

Almost surely, 2^43408591 is an apocalyptic number.

43408591 is a deficient number, since it is larger than the sum of its proper divisors (1).

43408591 is an equidigital number, since it uses as much as digits as its factorization.

43408591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 43408591 is about 6588.5196364586. The cubic root of 43408591 is about 351.4459663055.

The spelling of 43408591 in words is "forty-three million, four hundred eight thousand, five hundred ninety-one".