11691643 has 2 divisors, whose sum is σ = 11691644. Its totient is φ = 11691642.

The previous prime is 11691587. The next prime is 11691649. The reversal of 11691643 is 34619611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11691643 is a prime.

It is not a weakly prime, because it can be changed into another prime (11691649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5845821 + 5845822.

It is an arithmetic number, because the mean of its divisors is an integer number (5845822).

Almost surely, 2^11691643 is an apocalyptic number.

11691643 is a deficient number, since it is larger than the sum of its proper divisors (1).

11691643 is an equidigital number, since it uses as much as digits as its factorization.

11691643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 11691643 is about 3419.3044614366. The cubic root of 11691643 is about 226.9648040032.

The spelling of 11691643 in words is "eleven million, six hundred ninety-one thousand, six hundred forty-three".