856949111 has 16 divisors (see below), whose sum is σ = 904255488. Its totient is φ = 810532800.

The previous prime is 856949087. The next prime is 856949179. The reversal of 856949111 is 111949658.

It is a cyclic number.

It is not a de Polignac number, because 856949111 - 2⁶ = 856949047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856949011) 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 15 ways as a sum of consecutive naturals, for example, 1357766 + ... + 1358396.

It is an arithmetic number, because the mean of its divisors is an integer number (56515968).

Almost surely, 2^856949111 is an apocalyptic number.

856949111 is a deficient number, since it is larger than the sum of its proper divisors (47306377).

856949111 is a wasteful number, since it uses less digits than its factorization.

856949111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222.

The product of its digits is 77760, while the sum is 44.

The square root of 856949111 is about 29273.6931561428. The cubic root of 856949111 is about 949.8426742243.

The spelling of 856949111 in words is "eight hundred fifty-six million, nine hundred forty-nine thousand, one hundred eleven".