4431681 has 6 divisors (see below), whose sum is σ = 6401330. Its totient is φ = 2954448.

The previous prime is 4431673. The next prime is 4431683. The reversal of 4431681 is 1861344.

It can be written as a sum of positive squares in only one way, i.e., 3186225 + 1245456 = 1785^2 + 1116^2 .

It is not a de Polignac number, because 4431681 - 2³ = 4431673 is a prime.

It is a super-2 number, since 2×4431681² = 39279592971522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4431683) 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 5 ways as a sum of consecutive naturals, for example, 246196 + ... + 246213.

Almost surely, 2^4431681 is an apocalyptic number.

It is an amenable number.

4431681 is a deficient number, since it is larger than the sum of its proper divisors (1969649).

4431681 is a wasteful number, since it uses less digits than its factorization.

4431681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492415 (or 492412 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 4431681 is about 2105.1558137107. The cubic root of 4431681 is about 164.2566005840.

The spelling of 4431681 in words is "four million, four hundred thirty-one thousand, six hundred eighty-one".