1111111 has 4 divisors (see below), whose sum is σ = 1116000.
Its totient is φ = 1106224.
The previous prime is 1111091. The next prime is 1111151.
It is a happy number.
1111111 is nontrivially palindromic in base 10.
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 1111111 - 27 = 1110983 is a prime.
It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.
1111111 is a strobogrammatic number because it is the same when read upside-down.
It is a deceptive number, since it divides R1111110.
It is a Duffinian number.
1111111 is a modest number, since divided by 1111 gives 111 as remainder.
1111111 is a nontrivial repdigit in base 10.
It is a plaindrome in base 10.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 1111094 and 1111103.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1111151) by changing a digit.
It is a nontrivial repunit in base 10.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086 + ... + 2563.
It is an arithmetic number, because the mean of its divisors is an integer number (279000).
21111111 is an apocalyptic number.
1111111 is a deficient number, since it is larger than the sum of its proper divisors (4889).
1111111 is an equidigital number, since it uses as much as digits as its factorization.
1111111 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4888.
The product of its digits is 1, while the sum is 7.
The square root of 1111111 is about 1054.0925006848.
The cubic root of 1111111 is about 103.5744134126.
It can be divided in two parts, 11111 and 11, that multiplied together give a palindrome (122221).
The spelling of 1111111 in words is "one million, one hundred eleven thousand, one hundred eleven".