1188101 has 8 divisors (see below), whose sum is σ = 1253880. Its totient is φ = 1124032.

The previous prime is 1188073. The next prime is 1188149. The reversal of 1188101 is 1018811.

It is a Cunningham number, because it is equal to 1090²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 75076 + 1113025 = 274^2 + 1055^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1188101 - 2⁶ = 1188037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1151 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (156735).

2^1188101 is an apocalyptic number.

It is an amenable number.

1188101 is a deficient number, since it is larger than the sum of its proper divisors (65779).

1188101 is an equidigital number, since it uses as much as digits as its factorization.

1188101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855.

The product of its (nonzero) digits is 64, while the sum is 20.

The square root of 1188101 is about 1090.0004587155. Note that the first 3 decimals coincide. The cubic root of 1188101 is about 105.9134513651.

It can be divided in two parts, 118810 and 1, that added together give a palindrome (118811).

The spelling of 1188101 in words is "one million, one hundred eighty-eight thousand, one hundred one".