42433681 has 2 divisors, whose sum is σ = 42433682. Its totient is φ = 42433680.

The previous prime is 42433679. The next prime is 42433691. The reversal of 42433681 is 18633424.

42433681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33930625 + 8503056 = 5825^2 + 2916^2 .

It is a cyclic number.

It is not a de Polignac number, because 42433681 - 2¹ = 42433679 is a prime.

It is a super-2 number, since 2×42433681² = 3601234566419522, which contains 22 as substring.

Together with 42433679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42433661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21216840 + 21216841.

It is an arithmetic number, because the mean of its divisors is an integer number (21216841).

Almost surely, 2^42433681 is an apocalyptic number.

It is an amenable number.

42433681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42433681 is an equidigital number, since it uses as much as digits as its factorization.

42433681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 31.

The square root of 42433681 is about 6514.1139842652. The cubic root of 42433681 is about 348.7949880086.

The spelling of 42433681 in words is "forty-two million, four hundred thirty-three thousand, six hundred eighty-one".