43420056409 has 2 divisors, whose sum is σ = 43420056410. Its totient is φ = 43420056408.

The previous prime is 43420056403. The next prime is 43420056419. The reversal of 43420056409 is 90465002434.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27846264384 + 15573792025 = 166872^2 + 124795^2 .

It is a cyclic number.

It is not a de Polignac number, because 43420056409 - 2⁵ = 43420056377 is a prime.

It is not a weakly prime, because it can be changed into another prime (43420056403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710028204 + 21710028205.

It is an arithmetic number, because the mean of its divisors is an integer number (21710028205).

Almost surely, 2^43420056409 is an apocalyptic number.

It is an amenable number.

43420056409 is a deficient number, since it is larger than the sum of its proper divisors (1).

43420056409 is an equidigital number, since it uses as much as digits as its factorization.

43420056409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 43420056409 in words is "forty-three billion, four hundred twenty million, fifty-six thousand, four hundred nine".