8194094981 has 2 divisors, whose sum is σ = 8194094982. Its totient is φ = 8194094980.

The previous prime is 8194094963. The next prime is 8194095001. The reversal of 8194094981 is 1894904918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6768352900 + 1425742081 = 82270^2 + 37759^2 .

It is a cyclic number.

It is not a de Polignac number, because 8194094981 - 2³⁰ = 7120353157 is a prime.

It is a super-2 number, since 2×8194094981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8194090981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4097047490 + 4097047491.

It is an arithmetic number, because the mean of its divisors is an integer number (4097047491).

Almost surely, 2^8194094981 is an apocalyptic number.

It is an amenable number.

8194094981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8194094981 is an equidigital number, since it uses as much as digits as its factorization.

8194094981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 8194094981 is about 90521.2404963609. The cubic root of 8194094981 is about 2016.0455083271.

The spelling of 8194094981 in words is "eight billion, one hundred ninety-four million, ninety-four thousand, nine hundred eighty-one".