1191611 has 2 divisors, whose sum is σ = 1191612. Its totient is φ = 1191610.

The previous prime is 1191601. The next prime is 1191613. The reversal of 1191611 is 1161911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191611 - 2¹⁰ = 1190587 is a prime.

Together with 1191613, it forms a pair of twin primes.

It is a Chen prime.

1191611 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (1191613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595805 + 595806.

It is an arithmetic number, because the mean of its divisors is an integer number (595806).

2^1191611 is an apocalyptic number.

1191611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191611 is an equidigital number, since it uses as much as digits as its factorization.

1191611 is an evil number, because the sum of its binary digits is even.

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

The square root of 1191611 is about 1091.6093623637. The cubic root of 1191611 is about 106.0176486575.

The spelling of 1191611 in words is "one million, one hundred ninety-one thousand, six hundred eleven".