1131791 has 4 divisors (see below), whose sum is σ = 1134000. Its totient is φ = 1129584.

The previous prime is 1131787. The next prime is 1131799. The reversal of 1131791 is 1971311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1971311 = 191 ⋅10321.

It is a cyclic number.

It is not a de Polignac number, because 1131791 - 2² = 1131787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131799) 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, 110 + ... + 1508.

It is an arithmetic number, because the mean of its divisors is an integer number (283500).

2^1131791 is an apocalyptic number.

1131791 is a deficient number, since it is larger than the sum of its proper divisors (2209).

1131791 is an equidigital number, since it uses as much as digits as its factorization.

1131791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208.

The product of its digits is 189, while the sum is 23.

The square root of 1131791 is about 1063.8566632775. The cubic root of 1131791 is about 104.2130433138.

The spelling of 1131791 in words is "one million, one hundred thirty-one thousand, seven hundred ninety-one".