8087540821 has 2 divisors, whose sum is σ = 8087540822. Its totient is φ = 8087540820.

The previous prime is 8087540801. The next prime is 8087540827. The reversal of 8087540821 is 1280457808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7334038321 + 753502500 = 85639^2 + 27450^2 .

It is a cyclic number.

It is not a de Polignac number, because 8087540821 - 2⁵ = 8087540789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8087540827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4043770410 + 4043770411.

It is an arithmetic number, because the mean of its divisors is an integer number (4043770411).

Almost surely, 2^8087540821 is an apocalyptic number.

It is an amenable number.

8087540821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8087540821 is an equidigital number, since it uses as much as digits as its factorization.

8087540821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 143360, while the sum is 43.

The square root of 8087540821 is about 89930.7557012616. The cubic root of 8087540821 is about 2007.2686199965.

The spelling of 8087540821 in words is "eight billion, eighty-seven million, five hundred forty thousand, eight hundred twenty-one".