1181605 has 12 divisors (see below), whose sum is σ = 1473732. Its totient is φ = 909440.

The previous prime is 1181581. The next prime is 1181611. The reversal of 1181605 is 5061811.

It can be written as a sum of positive squares in 6 ways, for example, as 2209 + 1179396 = 47^2 + 1086^2 .

It is not a de Polignac number, because 1181605 - 2⁵ = 1181573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4065 + ... + 4345.

It is an arithmetic number, because the mean of its divisors is an integer number (122811).

2^1181605 is an apocalyptic number.

It is an amenable number.

1181605 is a deficient number, since it is larger than the sum of its proper divisors (292127).

1181605 is an equidigital number, since it uses as much as digits as its factorization.

1181605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1181605 is about 1087.0165592115. The cubic root of 1181605 is about 105.7200695121.

The spelling of 1181605 in words is "one million, one hundred eighty-one thousand, six hundred five".