11820161 has 2 divisors, whose sum is σ = 11820162. Its totient is φ = 11820160.

The previous prime is 11820121. The next prime is 11820167. The reversal of 11820161 is 16102811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 48400 = 3431^2 + 220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11820161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11820167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5910080 + 5910081.

It is an arithmetic number, because the mean of its divisors is an integer number (5910081).

Almost surely, 2^11820161 is an apocalyptic number.

It is an amenable number.

11820161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11820161 is an equidigital number, since it uses as much as digits as its factorization.

11820161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 11820161 is about 3438.0461020760. The cubic root of 11820161 is about 227.7933967653.

Adding to 11820161 its reverse (16102811), we get a palindrome (27922972).

The spelling of 11820161 in words is "eleven million, eight hundred twenty thousand, one hundred sixty-one".