71068513 has 4 divisors (see below), whose sum is σ = 71192260. Its totient is φ = 70944768.

The previous prime is 71068511. The next prime is 71068541. The reversal of 71068513 is 31586017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65173329 + 5895184 = 8073^2 + 2428^2 .

It is a cyclic number.

It is not a de Polignac number, because 71068513 - 2¹ = 71068511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71068511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61008 + ... + 62161.

It is an arithmetic number, because the mean of its divisors is an integer number (17798065).

Almost surely, 2^71068513 is an apocalyptic number.

It is an amenable number.

71068513 is a deficient number, since it is larger than the sum of its proper divisors (123747).

71068513 is a wasteful number, since it uses less digits than its factorization.

71068513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123746.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 71068513 is about 8430.2142914638. The cubic root of 71068513 is about 414.2149245391.

The spelling of 71068513 in words is "seventy-one million, sixty-eight thousand, five hundred thirteen".