856111 has 2 divisors, whose sum is σ = 856112. Its totient is φ = 856110.

The previous prime is 856099. The next prime is 856117. The reversal of 856111 is 111658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856111 - 2⁷ = 855983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428055 + 428056.

It is an arithmetic number, because the mean of its divisors is an integer number (428056).

2⁸⁵⁶¹¹¹ is an apocalyptic number.

856111 is a deficient number, since it is larger than the sum of its proper divisors (1).

856111 is an equidigital number, since it uses as much as digits as its factorization.

856111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 22.

The square root of 856111 is about 925.2626654091. The cubic root of 856111 is about 94.9532919052.

Adding to 856111 its reverse (111658), we get a palindrome (967769).

The spelling of 856111 in words is "eight hundred fifty-six thousand, one hundred eleven".