1191081 has 4 divisors (see below), whose sum is σ = 1588112. Its totient is φ = 794052.

The previous prime is 1191079. The next prime is 1191089. The reversal of 1191081 is 1801911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1191081 - 2¹ = 1191079 is a prime.

It is a super-2 number, since 2×1191081² = 2837347897122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

1191081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1191089) 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, 198511 + ... + 198516.

It is an arithmetic number, because the mean of its divisors is an integer number (397028).

2^1191081 is an apocalyptic number.

It is an amenable number.

1191081 is a deficient number, since it is larger than the sum of its proper divisors (397031).

1191081 is an equidigital number, since it uses as much as digits as its factorization.

1191081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397030.

The product of its (nonzero) digits is 72, while the sum is 21.

The square root of 1191081 is about 1091.3665745294. The cubic root of 1191081 is about 106.0019282905.

Adding to 1191081 its reverse (1801911), we get a palindrome (2992992).

The spelling of 1191081 in words is "one million, one hundred ninety-one thousand, eighty-one".