820116071 has 4 divisors (see below), whose sum is σ = 840118944. Its totient is φ = 800113200.

The previous prime is 820116053. The next prime is 820116079. The reversal of 820116071 is 170611028.

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 820116071 - 2⁶ = 820116007 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 820116071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820116079) 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 in 3 ways as a sum of consecutive naturals, for example, 10001375 + ... + 10001456.

It is an arithmetic number, because the mean of its divisors is an integer number (210029736).

Almost surely, 2^820116071 is an apocalyptic number.

820116071 is a deficient number, since it is larger than the sum of its proper divisors (20002873).

820116071 is a wasteful number, since it uses less digits than its factorization.

820116071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20002872.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 820116071 is about 28637.6687424099. The cubic root of 820116071 is about 936.0343233663.

Adding to 820116071 its reverse (170611028), we get a palindrome (990727099).

The spelling of 820116071 in words is "eight hundred twenty million, one hundred sixteen thousand, seventy-one".