71085919 has 2 divisors, whose sum is σ = 71085920. Its totient is φ = 71085918.

The previous prime is 71085913. The next prime is 71085947. The reversal of 71085919 is 91958017.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (91958017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71085919 - 2⁵ = 71085887 is a prime.

It is a super-2 number, since 2×71085919² = 10106415760149122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71085913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35542959 + 35542960.

It is an arithmetic number, because the mean of its divisors is an integer number (35542960).

Almost surely, 2^71085919 is an apocalyptic number.

71085919 is a deficient number, since it is larger than the sum of its proper divisors (1).

71085919 is an equidigital number, since it uses as much as digits as its factorization.

71085919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 71085919 is about 8431.2465863596. The cubic root of 71085919 is about 414.2487380905.

The spelling of 71085919 in words is "seventy-one million, eighty-five thousand, nine hundred nineteen".