31143112331 has 2 divisors, whose sum is σ = 31143112332. Its totient is φ = 31143112330.

The previous prime is 31143112313. The next prime is 31143112367. The reversal of 31143112331 is 13321134113.

Together with previous prime (31143112313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31143112331 - 2¹⁸ = 31142850187 is a prime.

It is a super-2 number, since 2×31143112331² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31143112297 and 31143112306.

It is not a weakly prime, because it can be changed into another prime (31143112631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571556165 + 15571556166.

It is an arithmetic number, because the mean of its divisors is an integer number (15571556166).

Almost surely, 2^31143112331 is an apocalyptic number.

31143112331 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143112331 is an equidigital number, since it uses as much as digits as its factorization.

31143112331 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 31143112331 its reverse (13321134113), we get a palindrome (44464246444).

The spelling of 31143112331 in words is "thirty-one billion, one hundred forty-three million, one hundred twelve thousand, three hundred thirty-one".