31131312143 has 2 divisors, whose sum is σ = 31131312144. Its totient is φ = 31131312142.

The previous prime is 31131312131. The next prime is 31131312161. The reversal of 31131312143 is 34121313113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31131312143 - 2³⁴ = 13951442959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31131312193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565656071 + 15565656072.

It is an arithmetic number, because the mean of its divisors is an integer number (15565656072).

Almost surely, 2^31131312143 is an apocalyptic number.

31131312143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131312143 is an equidigital number, since it uses as much as digits as its factorization.

31131312143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

Adding to 31131312143 its reverse (34121313113), we get a palindrome (65252625256).

The spelling of 31131312143 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, one hundred forty-three".