8966021381 has 2 divisors, whose sum is σ = 8966021382. Its totient is φ = 8966021380.

The previous prime is 8966021371. The next prime is 8966021429. The reversal of 8966021381 is 1831206698.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7640333281 + 1325688100 = 87409^2 + 36410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8966021381 is a prime.

It is a super-2 number, since 2×8966021381² (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 (8966021371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4483010690 + 4483010691.

It is an arithmetic number, because the mean of its divisors is an integer number (4483010691).

Almost surely, 2^8966021381 is an apocalyptic number.

It is an amenable number.

8966021381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8966021381 is an equidigital number, since it uses as much as digits as its factorization.

8966021381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 8966021381 is about 94689.0774112833. The cubic root of 8966021381 is about 2077.4628041937.

The spelling of 8966021381 in words is "eight billion, nine hundred sixty-six million, twenty-one thousand, three hundred eighty-one".