802111681 has 4 divisors (see below), whose sum is σ = 916699072. Its totient is φ = 687524292.

The previous prime is 802111669. The next prime is 802111691. The reversal of 802111681 is 186111208.

802111681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 802111681 - 2¹⁵ = 802078913 is a prime.

It is a super-2 number, since 2×802111681² = 1286766297593291522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (802111601) 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, 57293685 + ... + 57293698.

It is an arithmetic number, because the mean of its divisors is an integer number (229174768).

Almost surely, 2^802111681 is an apocalyptic number.

It is an amenable number.

802111681 is a deficient number, since it is larger than the sum of its proper divisors (114587391).

802111681 is a wasteful number, since it uses less digits than its factorization.

802111681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114587390.

The product of its (nonzero) digits is 768, while the sum is 28.

The square root of 802111681 is about 28321.5762449762. The cubic root of 802111681 is about 929.1338453483.

Adding to 802111681 its reverse (186111208), we get a palindrome (988222889).

The spelling of 802111681 in words is "eight hundred two million, one hundred eleven thousand, six hundred eighty-one".