1100155 has 24 divisors (see below), whose sum is σ = 1635552. Its totient is φ = 693504.

The previous prime is 1100149. The next prime is 1100161. The reversal of 1100155 is 5510011.

It is an interprime number because it is at equal distance from previous prime (1100149) and next prime (1100161).

It is not a de Polignac number, because 1100155 - 2³ = 1100147 is a prime.

It is a Duffinian number.

1100155 is a lucky 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 23 ways as a sum of consecutive naturals, for example, 25564 + ... + 25606.

It is an arithmetic number, because the mean of its divisors is an integer number (68148).

2^1100155 is an apocalyptic number.

1100155 is a deficient number, since it is larger than the sum of its proper divisors (535397).

1100155 is an equidigital number, since it uses as much as digits as its factorization.

1100155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 13.

The square root of 1100155 is about 1048.8827389179. The cubic root of 1100155 is about 103.2328599063.

Adding to 1100155 its reverse (5510011), we get a palindrome (6610166).

The spelling of 1100155 in words is "one million, one hundred thousand, one hundred fifty-five".