11155555 has 8 divisors (see below), whose sum is σ = 13406544. Its totient is φ = 8911200.

The previous prime is 11155549. The next prime is 11155561. The reversal of 11155555 is 55555111.

It is an interprime number because it is at equal distance from previous prime (11155549) and next prime (11155561).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11155555 - 2¹¹ = 11153507 is a prime.

It is a super-5 number, since 5×11155555⁵ (a number of 36 digits) contains 55555 as substring.

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

It is a Duffinian number.

11155555 is a modest number, since divided by 5555 gives 1115 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3520 + ... + 5890.

It is an arithmetic number, because the mean of its divisors is an integer number (1675818).

Almost surely, 2^11155555 is an apocalyptic number.

11155555 is a deficient number, since it is larger than the sum of its proper divisors (2250989).

11155555 is an equidigital number, since it uses as much as digits as its factorization.

11155555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3317.

The product of its digits is 3125, while the sum is 28.

The square root of 11155555 is about 3339.9932634663. The cubic root of 11155555 is about 223.4414429187.

It can be divided in two parts, 1115 and 5555, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 11155555 in words is "eleven million, one hundred fifty-five thousand, five hundred fifty-five".