1111555 has 4 divisors (see below), whose sum is σ = 1333872. Its totient is φ = 889240.

The previous prime is 1111553. The next prime is 1111559. The reversal of 1111555 is 5551111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1111555 - 2¹ = 1111553 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a Duffinian number.

1111555 is a lucky number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1111553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111151 + ... + 111160.

It is an arithmetic number, because the mean of its divisors is an integer number (333468).

2^1111555 is an apocalyptic number.

1111555 is a deficient number, since it is larger than the sum of its proper divisors (222317).

1111555 is an equidigital number, since it uses as much as digits as its factorization.

1111555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222316.

The product of its digits is 125, while the sum is 19.

The square root of 1111555 is about 1054.3030873520. The cubic root of 1111555 is about 103.5882076887.

Adding to 1111555 its reverse (5551111), we get a palindrome (6662666).

It can be divided in two parts, 1111 and 555, that multiplied together give a triangular number (616605 = T₁₁₁₀).

The spelling of 1111555 in words is "one million, one hundred eleven thousand, five hundred fifty-five".