5238443981 has 4 divisors (see below), whose sum is σ = 5251639452. Its totient is φ = 5225248512.

The previous prime is 5238443957. The next prime is 5238444019. The reversal of 5238443981 is 1893448325.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2527575625 + 2710868356 = 50275^2 + 52066^2 .

It is a cyclic number.

It is not a de Polignac number, because 5238443981 - 2²² = 5234249677 is a prime.

It is a super-2 number, since 2×5238443981² = 54882590684150256722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5238443921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6597140 + ... + 6597933.

It is an arithmetic number, because the mean of its divisors is an integer number (1312909863).

Almost surely, 2^5238443981 is an apocalyptic number.

It is an amenable number.

5238443981 is a deficient number, since it is larger than the sum of its proper divisors (13195471).

5238443981 is a wasteful number, since it uses less digits than its factorization.

5238443981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13195470.

The product of its digits is 829440, while the sum is 47.

The square root of 5238443981 is about 72377.0956933200. The cubic root of 5238443981 is about 1736.7371783579.

The spelling of 5238443981 in words is "five billion, two hundred thirty-eight million, four hundred forty-three thousand, nine hundred eighty-one".