11181601 has 2 divisors, whose sum is σ = 11181602. Its totient is φ = 11181600.

The previous prime is 11181587. The next prime is 11181619. The reversal of 11181601 is 10618111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 159201 = 3320^2 + 399^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 10918111 and 11181901.

It is a cyclic number.

It is not a de Polignac number, because 11181601 - 2⁹ = 11181089 is a prime.

It is not a weakly prime, because it can be changed into another prime (11181641) 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, 5590800 + 5590801.

It is an arithmetic number, because the mean of its divisors is an integer number (5590801).

Almost surely, 2^11181601 is an apocalyptic number.

It is an amenable number.

11181601 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181601 is an equidigital number, since it uses as much as digits as its factorization.

11181601 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 11181601 is about 3343.8900998687. The cubic root of 11181601 is about 223.6152048506.

Adding to 11181601 its reverse (10618111), we get a palindrome (21799712).

The spelling of 11181601 in words is "eleven million, one hundred eighty-one thousand, six hundred one".