31242443 has 4 divisors (see below), whose sum is σ = 31406208. Its totient is φ = 31078680.

The previous prime is 31242433. The next prime is 31242457. The reversal of 31242443 is 34424213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34424213 = 337 ⋅102149.

It is a cyclic number.

It is not a de Polignac number, because 31242443 - 2¹⁶ = 31176907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31242433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81596 + ... + 81977.

It is an arithmetic number, because the mean of its divisors is an integer number (7851552).

Almost surely, 2^31242443 is an apocalyptic number.

31242443 is a deficient number, since it is larger than the sum of its proper divisors (163765).

31242443 is a wasteful number, since it uses less digits than its factorization.

31242443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163764.

The product of its digits is 2304, while the sum is 23.

The square root of 31242443 is about 5589.4939842530. The cubic root of 31242443 is about 314.9548704978.

Adding to 31242443 its reverse (34424213), we get a palindrome (65666656).

The spelling of 31242443 in words is "thirty-one million, two hundred forty-two thousand, four hundred forty-three".