71085013 has 2 divisors, whose sum is σ = 71085014. Its totient is φ = 71085012.

The previous prime is 71085011. The next prime is 71085089. The reversal of 71085013 is 31058017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63648484 + 7436529 = 7978^2 + 2727^2 .

It is a cyclic number.

It is not a de Polignac number, because 71085013 - 2¹ = 71085011 is a prime.

Together with 71085011, 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 (71085011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35542506 + 35542507.

It is an arithmetic number, because the mean of its divisors is an integer number (35542507).

Almost surely, 2^71085013 is an apocalyptic number.

It is an amenable number.

71085013 is a deficient number, since it is larger than the sum of its proper divisors (1).

71085013 is an equidigital number, since it uses as much as digits as its factorization.

71085013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 71085013 is about 8431.1928574787. The cubic root of 71085013 is about 414.2469781970.

It can be divided in two parts, 7108 and 5013, that added together give a palindrome (12121).

The spelling of 71085013 in words is "seventy-one million, eighty-five thousand, thirteen".