42443846981 has 2 divisors, whose sum is σ = 42443846982. Its totient is φ = 42443846980.

The previous prime is 42443846971. The next prime is 42443846989. The reversal of 42443846981 is 18964834424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41840702500 + 603144481 = 204550^2 + 24559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42443846981 is a prime.

It is a super-2 number, since 2×42443846981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42443846989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221923490 + 21221923491.

It is an arithmetic number, because the mean of its divisors is an integer number (21221923491).

Almost surely, 2^42443846981 is an apocalyptic number.

It is an amenable number.

42443846981 is a deficient number, since it is larger than the sum of its proper divisors (1).

42443846981 is an equidigital number, since it uses as much as digits as its factorization.

42443846981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5308416, while the sum is 53.

The spelling of 42443846981 in words is "forty-two billion, four hundred forty-three million, eight hundred forty-six thousand, nine hundred eighty-one".