31143312205 has 16 divisors (see below), whose sum is σ = 39344515200. Its totient is φ = 23599995840.

The previous prime is 31143312203. The next prime is 31143312223. The reversal of 31143312205 is 50221334113.

It is a happy number.

It is not a de Polignac number, because 31143312205 - 2¹ = 31143312203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31143312205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143312203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 800760 + ... + 838750.

It is an arithmetic number, because the mean of its divisors is an integer number (2459032200).

Almost surely, 2^31143312205 is an apocalyptic number.

It is an amenable number.

31143312205 is a deficient number, since it is larger than the sum of its proper divisors (8201202995).

31143312205 is a wasteful number, since it uses less digits than its factorization.

31143312205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46644.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 31143312205 its reverse (50221334113), we get a palindrome (81364646318).

The spelling of 31143312205 in words is "thirty-one billion, one hundred forty-three million, three hundred twelve thousand, two hundred five".