1188161 has 4 divisors (see below), whose sum is σ = 1279572. Its totient is φ = 1096752.

The previous prime is 1188151. The next prime is 1188167. The reversal of 1188161 is 1618811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1618811 = 307 ⋅5273.

It can be written as a sum of positive squares in 2 ways, for example, as 297025 + 891136 = 545^2 + 944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188161 - 2¹⁸ = 926017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1188161.

It is not an unprimeable number, because it can be changed into a prime (1188167) 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, 45686 + ... + 45711.

It is an arithmetic number, because the mean of its divisors is an integer number (319893).

2^1188161 is an apocalyptic number.

It is an amenable number.

1188161 is a deficient number, since it is larger than the sum of its proper divisors (91411).

1188161 is an equidigital number, since it uses as much as digits as its factorization.

1188161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91410.

The product of its digits is 384, while the sum is 26.

The square root of 1188161 is about 1090.0279812922. The cubic root of 1188161 is about 105.9152342383.

The spelling of 1188161 in words is "one million, one hundred eighty-eight thousand, one hundred sixty-one".