8771485721 has 2 divisors, whose sum is σ = 8771485722. Its totient is φ = 8771485720.

The previous prime is 8771485669. The next prime is 8771485727. The reversal of 8771485721 is 1275841778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4628761225 + 4142724496 = 68035^2 + 64364^2 .

It is a cyclic number.

It is not a de Polignac number, because 8771485721 - 2¹⁰ = 8771484697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8771485721.

It is not a weakly prime, because it can be changed into another prime (8771485727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4385742860 + 4385742861.

It is an arithmetic number, because the mean of its divisors is an integer number (4385742861).

Almost surely, 2^8771485721 is an apocalyptic number.

It is an amenable number.

8771485721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8771485721 is an equidigital number, since it uses as much as digits as its factorization.

8771485721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 878080, while the sum is 50.

The square root of 8771485721 is about 93656.2102639222. The cubic root of 8771485721 is about 2062.3279148056.

The spelling of 8771485721 in words is "eight billion, seven hundred seventy-one million, four hundred eighty-five thousand, seven hundred twenty-one".