68811571 has 4 divisors (see below), whose sum is σ = 70489944. Its totient is φ = 67133200.

The previous prime is 68811569. The next prime is 68811629. The reversal of 68811571 is 17511886.

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

It is a cyclic number.

It is not a de Polignac number, because 68811571 - 2¹ = 68811569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68811571.

It is not an unprimeable number, because it can be changed into a prime (68811511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839125 + ... + 839206.

It is an arithmetic number, because the mean of its divisors is an integer number (17622486).

Almost surely, 2^68811571 is an apocalyptic number.

68811571 is a deficient number, since it is larger than the sum of its proper divisors (1678373).

68811571 is a wasteful number, since it uses less digits than its factorization.

68811571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678372.

The product of its digits is 13440, while the sum is 37.

The square root of 68811571 is about 8295.2740159684. The cubic root of 68811571 is about 409.7828931861.

The spelling of 68811571 in words is "sixty-eight million, eight hundred eleven thousand, five hundred seventy-one".