865672811 has 4 divisors (see below), whose sum is σ = 886786824. Its totient is φ = 844558800.

The previous prime is 865672783. The next prime is 865672817. The reversal of 865672811 is 118276568.

It is a happy number.

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 865672811 - 2⁶ = 865672747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865672817) 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, 10556945 + ... + 10557026.

It is an arithmetic number, because the mean of its divisors is an integer number (221696706).

Almost surely, 2^865672811 is an apocalyptic number.

865672811 is a deficient number, since it is larger than the sum of its proper divisors (21114013).

865672811 is a wasteful number, since it uses less digits than its factorization.

865672811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21114012.

The product of its digits is 161280, while the sum is 44.

The square root of 865672811 is about 29422.3182465284. The cubic root of 865672811 is about 953.0549159124.

The spelling of 865672811 in words is "eight hundred sixty-five million, six hundred seventy-two thousand, eight hundred eleven".