1191847 has 2 divisors, whose sum is σ = 1191848. Its totient is φ = 1191846.

The previous prime is 1191833. The next prime is 1191899. The reversal of 1191847 is 7481911.

It is a weak prime.

It is an emirp because it is prime and its reverse (7481911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191847 - 2⁷ = 1191719 is a prime.

It is a Chen prime.

1191847 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595923 + 595924.

It is an arithmetic number, because the mean of its divisors is an integer number (595924).

2^1191847 is an apocalyptic number.

1191847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191847 is an equidigital number, since it uses as much as digits as its factorization.

1191847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 1191847 is about 1091.7174542893. The cubic root of 1191847 is about 106.0246471700.

Subtracting 1191847 from its reverse (7481911), we obtain a square (6290064 = 2508²).

The spelling of 1191847 in words is "one million, one hundred ninety-one thousand, eight hundred forty-seven".