8978525821 has 2 divisors, whose sum is σ = 8978525822. Its totient is φ = 8978525820.

The previous prime is 8978525797. The next prime is 8978525849. The reversal of 8978525821 is 1285258798.

8978525821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8498258596 + 480267225 = 92186^2 + 21915^2 .

It is a cyclic number.

It is not a de Polignac number, because 8978525821 - 2⁷ = 8978525693 is a prime.

It is a super-2 number, since 2×8978525821² (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 (8978585821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4489262910 + 4489262911.

It is an arithmetic number, because the mean of its divisors is an integer number (4489262911).

Almost surely, 2^8978525821 is an apocalyptic number.

It is an amenable number.

8978525821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8978525821 is an equidigital number, since it uses as much as digits as its factorization.

8978525821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3225600, while the sum is 55.

The square root of 8978525821 is about 94755.0833517654. The cubic root of 8978525821 is about 2078.4281317246.

The spelling of 8978525821 in words is "eight billion, nine hundred seventy-eight million, five hundred twenty-five thousand, eight hundred twenty-one".