3831661 has 2 divisors, whose sum is σ = 3831662. Its totient is φ = 3831660.

The previous prime is 3831649. The next prime is 3831689. The reversal of 3831661 is 1661383.

It is an a-pointer prime, because the next prime (3831689) can be obtained adding 3831661 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3261636 + 570025 = 1806^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 3831661 - 2¹¹ = 3829613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3831691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1915830 + 1915831.

It is an arithmetic number, because the mean of its divisors is an integer number (1915831).

Almost surely, 2^3831661 is an apocalyptic number.

It is an amenable number.

3831661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3831661 is an equidigital number, since it uses as much as digits as its factorization.

3831661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 3831661 is about 1957.4628987544. The cubic root of 3831661 is about 156.4812690447.

The spelling of 3831661 in words is "three million, eight hundred thirty-one thousand, six hundred sixty-one".