31111302143 has 2 divisors, whose sum is σ = 31111302144. Its totient is φ = 31111302142.

The previous prime is 31111302137. The next prime is 31111302181. The reversal of 31111302143 is 34120311113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31111302143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31111302043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555651071 + 15555651072.

It is an arithmetic number, because the mean of its divisors is an integer number (15555651072).

Almost surely, 2^31111302143 is an apocalyptic number.

31111302143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111302143 is an equidigital number, since it uses as much as digits as its factorization.

31111302143 is an odious number, because the sum of its binary digits is odd.

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

Adding to 31111302143 its reverse (34120311113), we get a palindrome (65231613256).

The spelling of 31111302143 in words is "thirty-one billion, one hundred eleven million, three hundred two thousand, one hundred forty-three".