3111665 has 4 divisors (see below), whose sum is σ = 3734004. Its totient is φ = 2489328.

The previous prime is 3111659. The next prime is 3111673. The reversal of 3111665 is 5661113.

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 1669264 + 1442401 = 1292^2 + 1201^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111665 - 2¹² = 3107569 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3111665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311162 + ... + 311171.

It is an arithmetic number, because the mean of its divisors is an integer number (933501).

Almost surely, 2^3111665 is an apocalyptic number.

It is an amenable number.

3111665 is a deficient number, since it is larger than the sum of its proper divisors (622339).

3111665 is an equidigital number, since it uses as much as digits as its factorization.

3111665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622338.

The product of its digits is 540, while the sum is 23.

The square root of 3111665 is about 1763.9912131300. The cubic root of 3111665 is about 145.9926342690.

Adding to 3111665 its reverse (5661113), we get a palindrome (8772778).

The spelling of 3111665 in words is "three million, one hundred eleven thousand, six hundred sixty-five".