31144223133 has 12 divisors (see below), whose sum is σ = 45113544060. Its totient is φ = 20703995136.

The previous prime is 31144223063. The next prime is 31144223177. The reversal of 31144223133 is 33132244113.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21904592004 + 9239631129 = 148002^2 + 96123^2 .

It is not a de Polignac number, because 31144223133 - 2⁸ = 31144222877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31144223097 and 31144223106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144223183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4898338 + ... + 4904691.

It is an arithmetic number, because the mean of its divisors is an integer number (3759462005).

Almost surely, 2^31144223133 is an apocalyptic number.

It is an amenable number.

31144223133 is a deficient number, since it is larger than the sum of its proper divisors (13969320927).

31144223133 is a wasteful number, since it uses less digits than its factorization.

31144223133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9803388 (or 9803385 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 31144223133 its reverse (33132244113), we get a palindrome (64276467246).

The spelling of 31144223133 in words is "thirty-one billion, one hundred forty-four million, two hundred twenty-three thousand, one hundred thirty-three".