1181005 has 16 divisors (see below), whose sum is σ = 1661184. Its totient is φ = 789120.

The previous prime is 1180997. The next prime is 1181017. The reversal of 1181005 is 5001811.

It is not a de Polignac number, because 1181005 - 2³ = 1180997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1181005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1024 + ... + 1846.

It is an arithmetic number, because the mean of its divisors is an integer number (103824).

2^1181005 is an apocalyptic number.

It is an amenable number.

1181005 is a deficient number, since it is larger than the sum of its proper divisors (480179).

1181005 is an equidigital number, since it uses as much as digits as its factorization.

1181005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 1181005 is about 1086.7405394113. The cubic root of 1181005 is about 105.7021721659.

Adding to 1181005 its reverse (5001811), we get a palindrome (6182816).

The spelling of 1181005 in words is "one million, one hundred eighty-one thousand, five".