1191667 has 2 divisors, whose sum is σ = 1191668. Its totient is φ = 1191666.

The previous prime is 1191643. The next prime is 1191679. The reversal of 1191667 is 7661911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191667 - 2⁷ = 1191539 is a prime.

It is a Chen prime.

1191667 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1191637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595833 + 595834.

It is an arithmetic number, because the mean of its divisors is an integer number (595834).

2^1191667 is an apocalyptic number.

1191667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191667 is an equidigital number, since it uses as much as digits as its factorization.

1191667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 31.

The square root of 1191667 is about 1091.6350122637. The cubic root of 1191667 is about 106.0193094051.

The spelling of 1191667 in words is "one million, one hundred ninety-one thousand, six hundred sixty-seven".