1191923 has 2 divisors, whose sum is σ = 1191924. Its totient is φ = 1191922.

The previous prime is 1191899. The next prime is 1191937. The reversal of 1191923 is 3291911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191923 - 2⁸ = 1191667 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1191892 and 1191901.

It is not a weakly prime, because it can be changed into another prime (1191973) 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, 595961 + 595962.

It is an arithmetic number, because the mean of its divisors is an integer number (595962).

2^1191923 is an apocalyptic number.

1191923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191923 is an equidigital number, since it uses as much as digits as its factorization.

1191923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 26.

The square root of 1191923 is about 1091.7522612754. The cubic root of 1191923 is about 106.0269007316.

The spelling of 1191923 in words is "one million, one hundred ninety-one thousand, nine hundred twenty-three".