1191947 has 2 divisors, whose sum is σ = 1191948. Its totient is φ = 1191946.

The previous prime is 1191941. The next prime is 1191973. The reversal of 1191947 is 7491911.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1191947 - 2⁸ = 1191691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1191941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595973 + 595974.

It is an arithmetic number, because the mean of its divisors is an integer number (595974).

2^1191947 is an apocalyptic number.

1191947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191947 is an equidigital number, since it uses as much as digits as its factorization.

1191947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 32.

The square root of 1191947 is about 1091.7632527247. The cubic root of 1191947 is about 106.0276123627.

The spelling of 1191947 in words is "one million, one hundred ninety-one thousand, nine hundred forty-seven".