11811601 has 2 divisors, whose sum is σ = 11811602. Its totient is φ = 11811600.

The previous prime is 11811599. The next prime is 11811607. The reversal of 11811601 is 10611811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7568001 + 4243600 = 2751^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 11811601 - 2¹ = 11811599 is a prime.

Together with 11811599, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11811607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905800 + 5905801.

It is an arithmetic number, because the mean of its divisors is an integer number (5905801).

Almost surely, 2^11811601 is an apocalyptic number.

It is an amenable number.

11811601 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811601 is an equidigital number, since it uses as much as digits as its factorization.

11811601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 19.

The square root of 11811601 is about 3436.8009834729. The cubic root of 11811601 is about 227.7383951917.

The spelling of 11811601 in words is "eleven million, eight hundred eleven thousand, six hundred one".