5441921981 has 2 divisors, whose sum is σ = 5441921982. Its totient is φ = 5441921980.

The previous prime is 5441921977. The next prime is 5441922011. The reversal of 5441921981 is 1891291445.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5439062500 + 2859481 = 73750^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 5441921981 - 2² = 5441921977 is a prime.

It is a super-2 number, since 2×5441921981² = 59229029694581928722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5441921971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2720960990 + 2720960991.

It is an arithmetic number, because the mean of its divisors is an integer number (2720960991).

Almost surely, 2^5441921981 is an apocalyptic number.

It is an amenable number.

5441921981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5441921981 is an equidigital number, since it uses as much as digits as its factorization.

5441921981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 44.

The square root of 5441921981 is about 73769.3837645402. The cubic root of 5441921981 is about 1758.9389675904.

The spelling of 5441921981 in words is "five billion, four hundred forty-one million, nine hundred twenty-one thousand, nine hundred eighty-one".