71085913 has 2 divisors, whose sum is σ = 71085914. Its totient is φ = 71085912.

The previous prime is 71085901. The next prime is 71085919. The reversal of 71085913 is 31958017.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69089344 + 1996569 = 8312^2 + 1413^2 .

It is a cyclic number.

It is not a de Polignac number, because 71085913 - 2⁹ = 71085401 is a prime.

It is not a weakly prime, because it can be changed into another prime (71085919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35542956 + 35542957.

It is an arithmetic number, because the mean of its divisors is an integer number (35542957).

Almost surely, 2^71085913 is an apocalyptic number.

It is an amenable number.

71085913 is a deficient number, since it is larger than the sum of its proper divisors (1).

71085913 is an equidigital number, since it uses as much as digits as its factorization.

71085913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 71085913 is about 8431.2462305403. The cubic root of 71085913 is about 414.2487264356.

The spelling of 71085913 in words is "seventy-one million, eighty-five thousand, nine hundred thirteen".