5263688981 has 2 divisors, whose sum is σ = 5263688982. Its totient is φ = 5263688980.

The previous prime is 5263688977. The next prime is 5263688987. The reversal of 5263688981 is 1898863625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4926636100 + 337052881 = 70190^2 + 18359^2 .

It is a cyclic number.

It is not a de Polignac number, because 5263688981 - 2² = 5263688977 is a prime.

It is a super-4 number, since 4×5263688981⁴ (a number of 40 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5263688987) 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, 2631844490 + 2631844491.

It is an arithmetic number, because the mean of its divisors is an integer number (2631844491).

Almost surely, 2^5263688981 is an apocalyptic number.

It is an amenable number.

5263688981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5263688981 is an equidigital number, since it uses as much as digits as its factorization.

5263688981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 56.

The square root of 5263688981 is about 72551.2851781414. The cubic root of 5263688981 is about 1739.5225912021.

The spelling of 5263688981 in words is "five billion, two hundred sixty-three million, six hundred eighty-eight thousand, nine hundred eighty-one".