31143130211 has 4 divisors (see below), whose sum is σ = 31145977800. Its totient is φ = 31140282624.

The previous prime is 31143130171. The next prime is 31143130231. The reversal of 31143130211 is 11203134113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31143130211 - 2¹⁸ = 31142868067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31143130231) 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, 1407326 + ... + 1429283.

It is an arithmetic number, because the mean of its divisors is an integer number (7786494450).

Almost surely, 2^31143130211 is an apocalyptic number.

31143130211 is a deficient number, since it is larger than the sum of its proper divisors (2847589).

31143130211 is a wasteful number, since it uses less digits than its factorization.

31143130211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847588.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31143130211 its reverse (11203134113), we get a palindrome (42346264324).

The spelling of 31143130211 in words is "thirty-one billion, one hundred forty-three million, one hundred thirty thousand, two hundred eleven".