1191643 has 2 divisors, whose sum is σ = 1191644. Its totient is φ = 1191642.

The previous prime is 1191637. The next prime is 1191667. The reversal of 1191643 is 3461911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1191643 - 2⁵ = 1191611 is a prime.

It is a nialpdrome in base 11.

It is not a weakly prime, because it can be changed into another prime (1191613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595821 + 595822.

It is an arithmetic number, because the mean of its divisors is an integer number (595822).

2^1191643 is an apocalyptic number.

1191643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191643 is an equidigital number, since it uses as much as digits as its factorization.

1191643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 1191643 is about 1091.6240195232. The cubic root of 1191643 is about 106.0185976625.

The spelling of 1191643 in words is "one million, one hundred ninety-one thousand, six hundred forty-three".