3125681 has 4 divisors (see below), whose sum is σ = 3366132. Its totient is φ = 2885232.

The previous prime is 3125669. The next prime is 3125711. The reversal of 3125681 is 1865213.

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 167281 + 2958400 = 409^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125681 - 2¹⁰ = 3124657 is a prime.

It is a super-2 number, since 2×3125681² = 19539763427522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3125681.

It is not an unprimeable number, because it can be changed into a prime (3125611) 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 in 3 ways as a sum of consecutive naturals, for example, 120206 + ... + 120231.

It is an arithmetic number, because the mean of its divisors is an integer number (841533).

Almost surely, 2^3125681 is an apocalyptic number.

It is an amenable number.

3125681 is a deficient number, since it is larger than the sum of its proper divisors (240451).

3125681 is a wasteful number, since it uses less digits than its factorization.

3125681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240450.

The product of its digits is 1440, while the sum is 26.

The square root of 3125681 is about 1767.9595583610. The cubic root of 3125681 is about 146.2115061717.

The spelling of 3125681 in words is "three million, one hundred twenty-five thousand, six hundred eighty-one".