43220431081 has 2 divisors, whose sum is σ = 43220431082. Its totient is φ = 43220431080.

The previous prime is 43220431021. The next prime is 43220431123. The reversal of 43220431081 is 18013402234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39833773056 + 3386658025 = 199584^2 + 58195^2 .

It is a cyclic number.

It is not a de Polignac number, because 43220431081 - 2³³ = 34630496489 is a prime.

It is a super-2 number, since 2×43220431081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43220431021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21610215540 + 21610215541.

It is an arithmetic number, because the mean of its divisors is an integer number (21610215541).

Almost surely, 2^43220431081 is an apocalyptic number.

It is an amenable number.

43220431081 is a deficient number, since it is larger than the sum of its proper divisors (1).

43220431081 is an equidigital number, since it uses as much as digits as its factorization.

43220431081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 43220431081 in words is "forty-three billion, two hundred twenty million, four hundred thirty-one thousand, eighty-one".