8209794181 has 4 divisors (see below), whose sum is σ = 8364696012. Its totient is φ = 8054892352.

The previous prime is 8209794157. The next prime is 8209794193. The reversal of 8209794181 is 1814979028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7437510081 + 772284100 = 86241^2 + 27790^2 .

It is a cyclic number.

It is not a de Polignac number, because 8209794181 - 2¹⁷ = 8209663109 is a prime.

It is a super-2 number, since 2×8209794181² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8209794881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77450836 + ... + 77450941.

It is an arithmetic number, because the mean of its divisors is an integer number (2091174003).

Almost surely, 2^8209794181 is an apocalyptic number.

It is an amenable number.

8209794181 is a deficient number, since it is larger than the sum of its proper divisors (154901831).

8209794181 is a wasteful number, since it uses less digits than its factorization.

8209794181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154901830.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 8209794181 is about 90607.9145604842. The cubic root of 8209794181 is about 2017.3322117436.

The spelling of 8209794181 in words is "eight billion, two hundred nine million, seven hundred ninety-four thousand, one hundred eighty-one".