8945177981 has 2 divisors, whose sum is σ = 8945177982. Its totient is φ = 8945177980.

The previous prime is 8945177951. The next prime is 8945178037. The reversal of 8945177981 is 1897715498.

8945177981 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., 8669285881 + 275892100 = 93109^2 + 16610^2 .

It is a cyclic number.

It is not a de Polignac number, because 8945177981 - 2¹⁰ = 8945176957 is a prime.

It is a super-2 number, since 2×8945177981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8945177981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8945177951) 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, 4472588990 + 4472588991.

It is an arithmetic number, because the mean of its divisors is an integer number (4472588991).

Almost surely, 2^8945177981 is an apocalyptic number.

It is an amenable number.

8945177981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8945177981 is an equidigital number, since it uses as much as digits as its factorization.

8945177981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 59.

The square root of 8945177981 is about 94578.9510462027. The cubic root of 8945177981 is about 2075.8517222297.

The spelling of 8945177981 in words is "eight billion, nine hundred forty-five million, one hundred seventy-seven thousand, nine hundred eighty-one".