31140443 has 4 divisors (see below), whose sum is σ = 31900008. Its totient is φ = 30380880.

The previous prime is 31140419. The next prime is 31140467. The reversal of 31140443 is 34404113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34404113 = 23 ⋅1495831.

It is an interprime number because it is at equal distance from previous prime (31140419) and next prime (31140467).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31140443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31140493) 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, 379721 + ... + 379802.

It is an arithmetic number, because the mean of its divisors is an integer number (7975002).

Almost surely, 2^31140443 is an apocalyptic number.

31140443 is a deficient number, since it is larger than the sum of its proper divisors (759565).

31140443 is an equidigital number, since it uses as much as digits as its factorization.

31140443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759564.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 31140443 is about 5580.3622642262. The cubic root of 31140443 is about 314.6117430283.

Adding to 31140443 its reverse (34404113), we get a palindrome (65544556).

The spelling of 31140443 in words is "thirty-one million, one hundred forty thousand, four hundred forty-three".