1001191 has 2 divisors, whose sum is σ = 1001192. Its totient is φ = 1001190.

The previous prime is 1001177. The next prime is 1001197. The reversal of 1001191 is 1911001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001191 - 2⁵ = 1001159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500595 + 500596.

It is an arithmetic number, because the mean of its divisors is an integer number (500596).

2^1001191 is an apocalyptic number.

1001191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001191 is an equidigital number, since it uses as much as digits as its factorization.

1001191 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 13.

The square root of 1001191 is about 1000.5953227954. The cubic root of 1001191 is about 100.0396842495.

Adding to 1001191 its reverse (1911001), we get a palindrome (2912192).

It can be divided in two parts, 1001 and 191, that multiplied together give a palindrome (191191).

The spelling of 1001191 in words is "one million, one thousand, one hundred ninety-one".