43791491 has 2 divisors, whose sum is σ = 43791492. Its totient is φ = 43791490.

The previous prime is 43791481. The next prime is 43791497. The reversal of 43791491 is 19419734.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43791491 - 2⁶ = 43791427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43791497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21895745 + 21895746.

It is an arithmetic number, because the mean of its divisors is an integer number (21895746).

Almost surely, 2^43791491 is an apocalyptic number.

43791491 is a deficient number, since it is larger than the sum of its proper divisors (1).

43791491 is an equidigital number, since it uses as much as digits as its factorization.

43791491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 43791491 is about 6617.5139591844. The cubic root of 43791491 is about 352.4762916838.

The spelling of 43791491 in words is "forty-three million, seven hundred ninety-one thousand, four hundred ninety-one".