3161665 has 16 divisors (see below), whose sum is σ = 4128768. Its totient is φ = 2310336.

The previous prime is 3161651. The next prime is 3161681. The reversal of 3161665 is 5661613.

3161665 is nontrivially palindromic in base 12.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3161665 is a prime.

It is a super-2 number, since 2×3161665² = 19992251144450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8064 + ... + 8446.

It is an arithmetic number, because the mean of its divisors is an integer number (258048).

Almost surely, 2^3161665 is an apocalyptic number.

It is an amenable number.

3161665 is a deficient number, since it is larger than the sum of its proper divisors (967103).

3161665 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (3161664) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (528).

3161665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 3240, while the sum is 28.

The square root of 3161665 is about 1778.1071396291. The cubic root of 3161665 is about 146.7704470947.

The spelling of 3161665 in words is "three million, one hundred sixty-one thousand, six hundred sixty-five".