43431020505281 has 2 divisors, whose sum is σ = 43431020505282. Its totient is φ = 43431020505280.

The previous prime is 43431020505221. The next prime is 43431020505359. The reversal of 43431020505281 is 18250502013434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23054066146225 + 20376954359056 = 4801465^2 + 4514084^2 .

It is a cyclic number.

It is not a de Polignac number, because 43431020505281 - 2⁶ = 43431020505217 is a prime.

It is a super-2 number, since 2×43431020505281² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43431020505221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21715510252640 + 21715510252641.

It is an arithmetic number, because the mean of its divisors is an integer number (21715510252641).

Almost surely, 2^{43431020505281} is an apocalyptic number.

It is an amenable number.

43431020505281 is a deficient number, since it is larger than the sum of its proper divisors (1).

43431020505281 is an equidigital number, since it uses as much as digits as its factorization.

43431020505281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 43431020505281 in words is "forty-three trillion, four hundred thirty-one billion, twenty million, five hundred five thousand, two hundred eighty-one".