1191131 has 2 divisors, whose sum is σ = 1191132. Its totient is φ = 1191130.

The previous prime is 1191119. The next prime is 1191149. The reversal of 1191131 is 1311911.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1191131 is a prime.

It is a super-2 number, since 2×1191131² = 2837586118322, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1191191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595565 + 595566.

It is an arithmetic number, because the mean of its divisors is an integer number (595566).

2^1191131 is an apocalyptic number.

1191131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191131 is an equidigital number, since it uses as much as digits as its factorization.

1191131 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1191131 is about 1091.3894813493. The cubic root of 1191131 is about 106.0034115432.

The spelling of 1191131 in words is "one million, one hundred ninety-one thousand, one hundred thirty-one".