1191011 has 2 divisors, whose sum is σ = 1191012. Its totient is φ = 1191010.

The previous prime is 1190983. The next prime is 1191013. The reversal of 1191011 is 1101911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191011 - 2⁶ = 1190947 is a prime.

Together with 1191013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1191013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595505 + 595506.

It is an arithmetic number, because the mean of its divisors is an integer number (595506).

2^1191011 is an apocalyptic number.

1191011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191011 is an equidigital number, since it uses as much as digits as its factorization.

1191011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9, while the sum is 14.

The square root of 1191011 is about 1091.3345041737. The cubic root of 1191011 is about 105.9998516671. Note that the first 3 decimals are identical.

Adding to 1191011 its reverse (1101911), we get a palindrome (2292922).

The spelling of 1191011 in words is "one million, one hundred ninety-one thousand, eleven".