43242439681 has 6 divisors (see below), whose sum is σ = 50302429890. Its totient is φ = 37064948256.

The previous prime is 43242439631. The next prime is 43242439697. The reversal of 43242439681 is 18693424234.

It can be written as a sum of positive squares in only one way, i.e., 42897037456 + 345402225 = 207116^2 + 18585^2 .

It is not a de Polignac number, because 43242439681 - 2⁷ = 43242439553 is a prime.

It is a super-2 number, since 2×43242439681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43242439631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 441249336 + ... + 441249433.

It is an arithmetic number, because the mean of its divisors is an integer number (8383738315).

Almost surely, 2^43242439681 is an apocalyptic number.

It is an amenable number.

43242439681 is a deficient number, since it is larger than the sum of its proper divisors (7059990209).

43242439681 is an equidigital number, since it uses as much as digits as its factorization.

43242439681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882498783 (or 882498776 counting only the distinct ones).

The product of its digits is 995328, while the sum is 46.

The spelling of 43242439681 in words is "forty-three billion, two hundred forty-two million, four hundred thirty-nine thousand, six hundred eighty-one".