8174809681 has 4 divisors (see below), whose sum is σ = 8456699700. Its totient is φ = 7892919664.

The previous prime is 8174809649. The next prime is 8174809691. The reversal of 8174809681 is 1869084718.

It is a happy number.

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 6884850625 + 1289959056 = 82975^2 + 35916^2 .

It is a cyclic number.

It is not a de Polignac number, because 8174809681 - 2⁵ = 8174809649 is a prime.

It is a super-2 number, since 2×8174809681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8174809691) 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, 140944966 + ... + 140945023.

It is an arithmetic number, because the mean of its divisors is an integer number (2114174925).

Almost surely, 2^8174809681 is an apocalyptic number.

It is an amenable number.

8174809681 is a deficient number, since it is larger than the sum of its proper divisors (281890019).

8174809681 is a wasteful number, since it uses less digits than its factorization.

8174809681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281890018.

The product of its (nonzero) digits is 774144, while the sum is 52.

The square root of 8174809681 is about 90414.6541275251. The cubic root of 8174809681 is about 2014.4626373834.

The spelling of 8174809681 in words is "eight billion, one hundred seventy-four million, eight hundred nine thousand, six hundred eighty-one".