71121111031 has 2 divisors, whose sum is σ = 71121111032. Its totient is φ = 71121111030.

The previous prime is 71121111029. The next prime is 71121111041. The reversal of 71121111031 is 13011112117.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71121111031 - 2¹ = 71121111029 is a prime.

It is a super-2 number, since 2×71121111031² (a number of 23 digits) contains 22 as substring.

Together with 71121111029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71121111041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35560555515 + 35560555516.

It is an arithmetic number, because the mean of its divisors is an integer number (35560555516).

Almost surely, 2^71121111031 is an apocalyptic number.

71121111031 is a deficient number, since it is larger than the sum of its proper divisors (1).

71121111031 is an equidigital number, since it uses as much as digits as its factorization.

71121111031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 19.

Adding to 71121111031 its reverse (13011112117), we get a palindrome (84132223148).

The spelling of 71121111031 in words is "seventy-one billion, one hundred twenty-one million, one hundred eleven thousand, thirty-one".