3281378165 has 16 divisors (see below), whose sum is σ = 4489995888. Its totient is φ = 2280631296.

The previous prime is 3281378129. The next prime is 3281378201. The reversal of 3281378165 is 5618731823.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3281378129) and next prime (3281378201).

It can be written as a sum of positive squares in 8 ways, for example, as 19483396 + 3261894769 = 4414^2 + 57113^2 .

It is a cyclic number.

It is not a de Polignac number, because 3281378165 - 2¹² = 3281374069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1483682 + ... + 1485891.

It is an arithmetic number, because the mean of its divisors is an integer number (280624743).

Almost surely, 2^3281378165 is an apocalyptic number.

It is an amenable number.

3281378165 is a deficient number, since it is larger than the sum of its proper divisors (1208617723).

3281378165 is a wasteful number, since it uses less digits than its factorization.

3281378165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969608.

The product of its digits is 241920, while the sum is 44.

The square root of 3281378165 is about 57283.3148918601. The cubic root of 3281378165 is about 1485.9998353105. Note that the first 3 decimals are identical.

The spelling of 3281378165 in words is "three billion, two hundred eighty-one million, three hundred seventy-eight thousand, one hundred sixty-five".