44861471981 has 2 divisors, whose sum is σ = 44861471982. Its totient is φ = 44861471980.

The previous prime is 44861471971. The next prime is 44861472013. The reversal of 44861471981 is 18917416844.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24250275625 + 20611196356 = 155725^2 + 143566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44861471981 is a prime.

It is a super-2 number, since 2×44861471981² (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 (44861471971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22430735990 + 22430735991.

It is an arithmetic number, because the mean of its divisors is an integer number (22430735991).

Almost surely, 2^44861471981 is an apocalyptic number.

It is an amenable number.

44861471981 is a deficient number, since it is larger than the sum of its proper divisors (1).

44861471981 is an equidigital number, since it uses as much as digits as its factorization.

44861471981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 53.

The spelling of 44861471981 in words is "forty-four billion, eight hundred sixty-one million, four hundred seventy-one thousand, nine hundred eighty-one".