43604591 has 2 divisors, whose sum is σ = 43604592. Its totient is φ = 43604590.

The previous prime is 43604581. The next prime is 43604593. The reversal of 43604591 is 19540634.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43604591 is a prime.

Together with 43604593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43604593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21802295 + 21802296.

It is an arithmetic number, because the mean of its divisors is an integer number (21802296).

Almost surely, 2^43604591 is an apocalyptic number.

43604591 is a deficient number, since it is larger than the sum of its proper divisors (1).

43604591 is an equidigital number, since it uses as much as digits as its factorization.

43604591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 43604591 is about 6603.3772419876. The cubic root of 43604591 is about 351.9741259175.

The spelling of 43604591 in words is "forty-three million, six hundred four thousand, five hundred ninety-one".