1191005 has 4 divisors (see below), whose sum is σ = 1429212. Its totient is φ = 952800.

The previous prime is 1190983. The next prime is 1191011. The reversal of 1191005 is 5001911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164836 + 1026169 = 406^2 + 1013^2 .

It is not a de Polignac number, because 1191005 - 2¹⁶ = 1125469 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 3 ways as a sum of consecutive naturals, for example, 119096 + ... + 119105.

It is an arithmetic number, because the mean of its divisors is an integer number (357303).

2^1191005 is an apocalyptic number.

It is an amenable number.

1191005 is a deficient number, since it is larger than the sum of its proper divisors (238207).

1191005 is an equidigital number, since it uses as much as digits as its factorization.

1191005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238206.

The product of its (nonzero) digits is 45, while the sum is 17.

The square root of 1191005 is about 1091.3317552422. The cubic root of 1191005 is about 105.9996736670. Note that the first 3 decimals are identical.

Adding to 1191005 its reverse (5001911), we get a palindrome (6192916).

The spelling of 1191005 in words is "one million, one hundred ninety-one thousand, five".