31442443 has 4 divisors (see below), whose sum is σ = 31470120. Its totient is φ = 31414768.

The previous prime is 31442441. The next prime is 31442479. The reversal of 31442443 is 34424413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34424413 = 199 ⋅172987.

It is a cyclic number.

It is not a de Polignac number, because 31442443 - 2¹ = 31442441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31442441) 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, 12058 + ... + 14431.

It is an arithmetic number, because the mean of its divisors is an integer number (7867530).

Almost surely, 2^31442443 is an apocalyptic number.

31442443 is a deficient number, since it is larger than the sum of its proper divisors (27677).

31442443 is a wasteful number, since it uses less digits than its factorization.

31442443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27676.

The product of its digits is 4608, while the sum is 25.

The square root of 31442443 is about 5607.3561506293. The cubic root of 31442443 is about 315.6255077337.

Adding to 31442443 its reverse (34424413), we get a palindrome (65866856).

The spelling of 31442443 in words is "thirty-one million, four hundred forty-two thousand, four hundred forty-three".