1155005 has 4 divisors (see below), whose sum is σ = 1386012. Its totient is φ = 924000.

The previous prime is 1155001. The next prime is 1155017. The reversal of 1155005 is 5005511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5005511 = 7 ⋅715073.

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 1006009 = 386^2 + 1003^2 .

It is not a de Polignac number, because 1155005 - 2² = 1155001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155001) 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, 115496 + ... + 115505.

It is an arithmetic number, because the mean of its divisors is an integer number (346503).

2^1155005 is an apocalyptic number.

It is an amenable number.

1155005 is a deficient number, since it is larger than the sum of its proper divisors (231007).

1155005 is an equidigital number, since it uses as much as digits as its factorization.

1155005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231006.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 1155005 is about 1074.7115892182. The cubic root of 1155005 is about 104.9207262565.

It can be divided in two parts, 115 and 5005, that multiplied together give a palindrome (575575).

The spelling of 1155005 in words is "one million, one hundred fifty-five thousand, five".