1131191 has 2 divisors, whose sum is σ = 1131192. Its totient is φ = 1131190.

The previous prime is 1131181. The next prime is 1131217. The reversal of 1131191 is 1911311.

It is a weak prime.

It is an emirp because it is prime and its reverse (1911311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131191 - 2¹⁴ = 1114807 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565595 + 565596.

It is an arithmetic number, because the mean of its divisors is an integer number (565596).

2^1131191 is an apocalyptic number.

1131191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131191 is an equidigital number, since it uses as much as digits as its factorization.

1131191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27, while the sum is 17.

The square root of 1131191 is about 1063.5746330183. The cubic root of 1131191 is about 104.1946244600.

The spelling of 1131191 in words is "one million, one hundred thirty-one thousand, one hundred ninety-one".