8531299681 has 2 divisors, whose sum is σ = 8531299682. Its totient is φ = 8531299680.

The previous prime is 8531299607. The next prime is 8531299691. The reversal of 8531299681 is 1869921358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6059221281 + 2472078400 = 77841^2 + 49720^2 .

It is a cyclic number.

It is not a de Polignac number, because 8531299681 - 2²¹ = 8529202529 is a prime.

It is a super-2 number, since 2×8531299681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8531299691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4265649840 + 4265649841.

It is an arithmetic number, because the mean of its divisors is an integer number (4265649841).

Almost surely, 2^8531299681 is an apocalyptic number.

It is an amenable number.

8531299681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8531299681 is an equidigital number, since it uses as much as digits as its factorization.

8531299681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 52.

The square root of 8531299681 is about 92365.0349482963. The cubic root of 8531299681 is about 2043.3294727598.

The spelling of 8531299681 in words is "eight billion, five hundred thirty-one million, two hundred ninety-nine thousand, six hundred eighty-one".