5539973981 has 2 divisors, whose sum is σ = 5539973982. Its totient is φ = 5539973980.

The previous prime is 5539973977. The next prime is 5539974007. The reversal of 5539973981 is 1893799355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4582071481 + 957902500 = 67691^2 + 30950^2 .

It is a cyclic number.

It is not a de Polignac number, because 5539973981 - 2² = 5539973977 is a prime.

It is a super-2 number, since 2×5539973981² = 61382623420313976722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5539973981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5539973911) 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, 2769986990 + 2769986991.

It is an arithmetic number, because the mean of its divisors is an integer number (2769986991).

Almost surely, 2^5539973981 is an apocalyptic number.

It is an amenable number.

5539973981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5539973981 is an equidigital number, since it uses as much as digits as its factorization.

5539973981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9185400, while the sum is 59.

The square root of 5539973981 is about 74431.0014778788. The cubic root of 5539973981 is about 1769.4402755272.

The spelling of 5539973981 in words is "five billion, five hundred thirty-nine million, nine hundred seventy-three thousand, nine hundred eighty-one".