8945188621 has 2 divisors, whose sum is σ = 8945188622. Its totient is φ = 8945188620.

The previous prime is 8945188613. The next prime is 8945188687. The reversal of 8945188621 is 1268815498.

It is a happy number.

8945188621 is digitally balanced in base 2, 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., 8396973225 + 548215396 = 91635^2 + 23414^2 .

It is a cyclic number.

It is not a de Polignac number, because 8945188621 - 2³ = 8945188613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8945188121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4472594310 + 4472594311.

It is an arithmetic number, because the mean of its divisors is an integer number (4472594311).

Almost surely, 2^8945188621 is an apocalyptic number.

It is an amenable number.

8945188621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8945188621 is an equidigital number, since it uses as much as digits as its factorization.

8945188621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1105920, while the sum is 52.

The square root of 8945188621 is about 94579.0072954881. The cubic root of 8945188621 is about 2075.8525452822.

The spelling of 8945188621 in words is "eight billion, nine hundred forty-five million, one hundred eighty-eight thousand, six hundred twenty-one".