3125665 has 4 divisors (see below), whose sum is σ = 3750804. Its totient is φ = 2500528.

The previous prime is 3125659. The next prime is 3125669. The reversal of 3125665 is 5665213.

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 654481 + 2471184 = 809^2 + 1572^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125665 - 2⁷ = 3125537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3125669) 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, 312562 + ... + 312571.

It is an arithmetic number, because the mean of its divisors is an integer number (937701).

Almost surely, 2^3125665 is an apocalyptic number.

It is an amenable number.

3125665 is a deficient number, since it is larger than the sum of its proper divisors (625139).

3125665 is an equidigital number, since it uses as much as digits as its factorization.

3125665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625138.

The product of its digits is 5400, while the sum is 28.

The square root of 3125665 is about 1767.9550333648. The cubic root of 3125665 is about 146.2112566914.

The spelling of 3125665 in words is "three million, one hundred twenty-five thousand, six hundred sixty-five".