3231661 has 12 divisors (see below), whose sum is σ = 3483900. Its totient is φ = 2995520.

The previous prime is 3231643. The next prime is 3231667. The reversal of 3231661 is 1661323.

It can be written as a sum of positive squares in 2 ways, for example, as 256036 + 2975625 = 506^2 + 1725^2 .

It is not a de Polignac number, because 3231661 - 2¹⁵ = 3198893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3231667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21615 + ... + 21763.

It is an arithmetic number, because the mean of its divisors is an integer number (290325).

Almost surely, 2^3231661 is an apocalyptic number.

It is an amenable number.

3231661 is a deficient number, since it is larger than the sum of its proper divisors (252239).

3231661 is a wasteful number, since it uses less digits than its factorization.

3231661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 213 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The square root of 3231661 is about 1797.6821187296. The cubic root of 3231661 is about 147.8456663638.

Adding to 3231661 its reverse (1661323), we get a palindrome (4892984).

The spelling of 3231661 in words is "three million, two hundred thirty-one thousand, six hundred sixty-one".