42681231 has 6 divisors (see below), whose sum is σ = 61650680. Its totient is φ = 28454148.

The previous prime is 42681229. The next prime is 42681253. The reversal of 42681231 is 13218624.

42681231 is a `hidden beast` number, since 426 + 8 + 1 + 231 = 666.

42681231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42681231 - 2¹ = 42681229 is a prime.

It is a super-2 number, since 2×42681231² = 3643374959350722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42681195 and 42681204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42681731) 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 5 ways as a sum of consecutive naturals, for example, 2371171 + ... + 2371188.

Almost surely, 2^42681231 is an apocalyptic number.

42681231 is a deficient number, since it is larger than the sum of its proper divisors (18969449).

42681231 is a wasteful number, since it uses less digits than its factorization.

42681231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742365 (or 4742362 counting only the distinct ones).

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

The square root of 42681231 is about 6533.0874018338. The cubic root of 42681231 is about 349.4719411122.

Adding to 42681231 its reverse (13218624), we get a palindrome (55899855).

The spelling of 42681231 in words is "forty-two million, six hundred eighty-one thousand, two hundred thirty-one".