8194981 has 2 divisors, whose sum is σ = 8194982. Its totient is φ = 8194980.

The previous prime is 8194961. The next prime is 8194987. The reversal of 8194981 is 1894918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7784100 + 410881 = 2790^2 + 641^2 .

It is a cyclic number.

It is not a de Polignac number, because 8194981 - 2¹⁵ = 8162213 is a prime.

It is a super-2 number, since 2×8194981² = 134315427180722, which contains 22 as substring.

8194981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8194987) 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, 4097490 + 4097491.

It is an arithmetic number, because the mean of its divisors is an integer number (4097491).

Almost surely, 2^8194981 is an apocalyptic number.

It is an amenable number.

8194981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8194981 is an equidigital number, since it uses as much as digits as its factorization.

8194981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 40.

The square root of 8194981 is about 2862.6877231022. The cubic root of 8194981 is about 201.6118170012.

The spelling of 8194981 in words is "eight million, one hundred ninety-four thousand, nine hundred eighty-one".