3231681 has 4 divisors (see below), whose sum is σ = 4308912. Its totient is φ = 2154452.

The previous prime is 3231671. The next prime is 3231689. The reversal of 3231681 is 1861323.

3231681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1861323 = 3 ⋅620441.

It is a cyclic number.

It is not a de Polignac number, because 3231681 - 2¹⁴ = 3215297 is a prime.

It is a super-2 number, since 2×3231681² = 20887524171522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3231689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538611 + ... + 538616.

It is an arithmetic number, because the mean of its divisors is an integer number (1077228).

Almost surely, 2^3231681 is an apocalyptic number.

It is an amenable number.

3231681 is a deficient number, since it is larger than the sum of its proper divisors (1077231).

3231681 is a wasteful number, since it uses less digits than its factorization.

3231681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077230.

The product of its digits is 864, while the sum is 24.

The square root of 3231681 is about 1797.6876814397. The cubic root of 3231681 is about 147.8459713573.

It can be divided in two parts, 32 and 31681, that added together give a palindrome (31713).

The spelling of 3231681 in words is "three million, two hundred thirty-one thousand, six hundred eighty-one".