11995691 has 2 divisors, whose sum is σ = 11995692. Its totient is φ = 11995690.

The previous prime is 11995661. The next prime is 11995717. The reversal of 11995691 is 19659911.

11995691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11995691 is a prime.

It is not a weakly prime, because it can be changed into another prime (11995651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5997845 + 5997846.

It is an arithmetic number, because the mean of its divisors is an integer number (5997846).

Almost surely, 2^11995691 is an apocalyptic number.

11995691 is a deficient number, since it is larger than the sum of its proper divisors (1).

11995691 is an equidigital number, since it uses as much as digits as its factorization.

11995691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 41.

The square root of 11995691 is about 3463.4796087172. The cubic root of 11995691 is about 228.9154420429.

The spelling of 11995691 in words is "eleven million, nine hundred ninety-five thousand, six hundred ninety-one".