1161191 has 4 divisors (see below), whose sum is σ = 1163712. Its totient is φ = 1158672.

The previous prime is 1161169. The next prime is 1161203. The reversal of 1161191 is 1911611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1911611 = 13 ⋅147047.

It is a cyclic number.

It is not a de Polignac number, because 1161191 - 2¹⁰ = 1160167 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161101) 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, 350 + ... + 1563.

It is an arithmetic number, because the mean of its divisors is an integer number (290928).

2^1161191 is an apocalyptic number.

1161191 is a deficient number, since it is larger than the sum of its proper divisors (2521).

1161191 is an equidigital number, since it uses as much as digits as its factorization.

1161191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520.

The product of its digits is 54, while the sum is 20.

The square root of 1161191 is about 1077.5857274482. The cubic root of 1161191 is about 105.1077050531.

The spelling of 1161191 in words is "one million, one hundred sixty-one thousand, one hundred ninety-one".