1109555 has 12 divisors (see below), whose sum is σ = 1374240. Its totient is φ = 859872.

The previous prime is 1109533. The next prime is 1109561. The reversal of 1109555 is 5559011.

It is not a de Polignac number, because 1109555 - 2⁶ = 1109491 is a prime.

It is a super-2 number, since 2×1109555² = 2462224596050, which contains 22 as substring.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 14006 + ... + 14084.

It is an arithmetic number, because the mean of its divisors is an integer number (114520).

2^1109555 is an apocalyptic number.

1109555 is a deficient number, since it is larger than the sum of its proper divisors (264685).

1109555 is an frugal number, since it uses more digits than its factorization.

1109555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 1109555 is about 1053.3541664606. The cubic root of 1109555 is about 103.5260422850.

It can be divided in two parts, 1109 and 555, that multiplied together give a triangular number (615495 = T₁₁₀₉).

The spelling of 1109555 in words is "one million, one hundred nine thousand, five hundred fifty-five".