31440143443 has 4 divisors (see below), whose sum is σ = 31449799800. Its totient is φ = 31430487088.

The previous prime is 31440143419. The next prime is 31440143473. The reversal of 31440143443 is 34434104413.

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: 34434104413 = 9439 ⋅3648067.

It is a cyclic number.

It is not a de Polignac number, because 31440143443 - 2⁹ = 31440142931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31440143473) 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, 4823293 + ... + 4829806.

It is an arithmetic number, because the mean of its divisors is an integer number (7862449950).

Almost surely, 2^31440143443 is an apocalyptic number.

31440143443 is a deficient number, since it is larger than the sum of its proper divisors (9656357).

31440143443 is an equidigital number, since it uses as much as digits as its factorization.

31440143443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9656356.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 31440143443 its reverse (34434104413), we get a palindrome (65874247856).

The spelling of 31440143443 in words is "thirty-one billion, four hundred forty million, one hundred forty-three thousand, four hundred forty-three".