43240519991 has 2 divisors, whose sum is σ = 43240519992. Its totient is φ = 43240519990.

The previous prime is 43240519981. The next prime is 43240520033. The reversal of 43240519991 is 19991504234.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43240519991 - 2¹⁰ = 43240518967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43240519981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21620259995 + 21620259996.

It is an arithmetic number, because the mean of its divisors is an integer number (21620259996).

Almost surely, 2^43240519991 is an apocalyptic number.

43240519991 is a deficient number, since it is larger than the sum of its proper divisors (1).

43240519991 is an equidigital number, since it uses as much as digits as its factorization.

43240519991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 43240519991 in words is "forty-three billion, two hundred forty million, five hundred nineteen thousand, nine hundred ninety-one".