1191973 has 2 divisors, whose sum is σ = 1191974. Its totient is φ = 1191972.

The previous prime is 1191947. The next prime is 1191979. The reversal of 1191973 is 3791911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1181569 + 10404 = 1087^2 + 102^2 .

It is an emirp because it is prime and its reverse (3791911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191973 - 2⁵ = 1191941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191979) 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, 595986 + 595987.

It is an arithmetic number, because the mean of its divisors is an integer number (595987).

2^1191973 is an apocalyptic number.

It is an amenable number.

1191973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191973 is an equidigital number, since it uses as much as digits as its factorization.

1191973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701, while the sum is 31.

The square root of 1191973 is about 1091.7751600032. The cubic root of 1191973 is about 106.0283832857.

The spelling of 1191973 in words is "one million, one hundred ninety-one thousand, nine hundred seventy-three".