43019413909 has 2 divisors, whose sum is σ = 43019413910. Its totient is φ = 43019413908.

The previous prime is 43019413817. The next prime is 43019413949. The reversal of 43019413909 is 90931491034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38463838884 + 4555575025 = 196122^2 + 67495^2 .

It is a cyclic number.

It is not a de Polignac number, because 43019413909 - 2¹⁹ = 43018889621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43019413949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21509706954 + 21509706955.

It is an arithmetic number, because the mean of its divisors is an integer number (21509706955).

Almost surely, 2^43019413909 is an apocalyptic number.

It is an amenable number.

43019413909 is a deficient number, since it is larger than the sum of its proper divisors (1).

43019413909 is an equidigital number, since it uses as much as digits as its factorization.

43019413909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The spelling of 43019413909 in words is "forty-three billion, nineteen million, four hundred thirteen thousand, nine hundred nine".