8125681 has 4 divisors (see below), whose sum is σ = 8345332. Its totient is φ = 7906032.

The previous prime is 8125669. The next prime is 8125697. The reversal of 8125681 is 1865218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1865218 = 2 ⋅932609.

It can be written as a sum of positive squares in 2 ways, for example, as 3964081 + 4161600 = 1991^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 8125681 - 2¹⁵ = 8092913 is a prime.

It is a super-2 number, since 2×8125681² = 132053383427522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8125631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109770 + ... + 109843.

It is an arithmetic number, because the mean of its divisors is an integer number (2086333).

Almost surely, 2^8125681 is an apocalyptic number.

It is an amenable number.

8125681 is a deficient number, since it is larger than the sum of its proper divisors (219651).

8125681 is a wasteful number, since it uses less digits than its factorization.

8125681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219650.

The product of its digits is 3840, while the sum is 31.

The square root of 8125681 is about 2850.5580155471. The cubic root of 8125681 is about 201.0419044171.

The spelling of 8125681 in words is "eight million, one hundred twenty-five thousand, six hundred eighty-one".