71121112061 has 2 divisors, whose sum is σ = 71121112062.
Its totient is φ = 71121112060.
The previous prime is 71121111931. The next prime is 71121112063. The reversal of 71121112061 is 16021112117.
Adding to 71121112061 its reverse (16021112117), we get a palindrome (87142224178).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 47526616036 + 23594496025 = 218006^2 + 153605^2
It is a cyclic number.
It is not a de Polignac number, because 71121112061 - 214 = 71121095677 is a prime.
Together with 71121112063, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (71121112063) 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, 35560556030 + 35560556031.
It is an arithmetic number, because the mean of its divisors is an integer number (35560556031).
Almost surely, 271121112061 is an apocalyptic number.
It is an amenable number.
71121112061 is a deficient number, since it is larger than the sum of its proper divisors (1).
71121112061 is an equidigital number, since it uses as much as digits as its factorization.
71121112061 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 168, while the sum is 23.
The spelling of 71121112061 in words is "seventy-one billion, one hundred twenty-one million, one hundred twelve thousand, sixty-one".