8736523981 has 2 divisors, whose sum is σ = 8736523982. Its totient is φ = 8736523980.

The previous prime is 8736523967. The next prime is 8736523993. The reversal of 8736523981 is 1893256378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7651875625 + 1084648356 = 87475^2 + 32934^2 .

It is a cyclic number.

It is not a de Polignac number, because 8736523981 - 2⁷ = 8736523853 is a prime.

It is a super-2 number, since 2×8736523981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8736523181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4368261990 + 4368261991.

It is an arithmetic number, because the mean of its divisors is an integer number (4368261991).

Almost surely, 2^8736523981 is an apocalyptic number.

It is an amenable number.

8736523981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8736523981 is an equidigital number, since it uses as much as digits as its factorization.

8736523981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 52.

The square root of 8736523981 is about 93469.3745619387. The cubic root of 8736523981 is about 2059.5842298023.

The spelling of 8736523981 in words is "eight billion, seven hundred thirty-six million, five hundred twenty-three thousand, nine hundred eighty-one".