12002161 has 2 divisors, whose sum is σ = 12002162. Its totient is φ = 12002160.

The previous prime is 12002147. The next prime is 12002173. The reversal of 12002161 is 16120021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 230400 = 3431^2 + 480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12002161 is a prime.

It is not a weakly prime, because it can be changed into another prime (12002261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6001080 + 6001081.

It is an arithmetic number, because the mean of its divisors is an integer number (6001081).

Almost surely, 2^12002161 is an apocalyptic number.

It is an amenable number.

12002161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12002161 is an equidigital number, since it uses as much as digits as its factorization.

12002161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 12002161 is about 3464.4135145793. The cubic root of 12002161 is about 228.9565906162.

Adding to 12002161 its reverse (16120021), we get a palindrome (28122182).

The spelling of 12002161 in words is "twelve million, two thousand, one hundred sixty-one".