861111 has 10 divisors (see below), whose sum is σ = 1286472. Its totient is φ = 574020.

The previous prime is 861109. The next prime is 861121. The reversal of 861111 is 111168.

It is not a de Polignac number, because 861111 - 2¹ = 861109 is a prime.

861111 is a modest number, since divided by 1111 gives 86 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5235 + ... + 5396.

2⁸⁶¹¹¹¹ is an apocalyptic number.

861111 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

861111 is a deficient number, since it is larger than the sum of its proper divisors (425361).

861111 is a wasteful number, since it uses less digits than its factorization.

861111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643 (or 10634 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 861111 is about 927.9606672699. The cubic root of 861111 is about 95.1377871311.

Adding to 861111 its reverse (111168), we get a palindrome (972279).

The spelling of 861111 in words is "eight hundred sixty-one thousand, one hundred eleven".