12162001 has 2 divisors, whose sum is σ = 12162002. Its totient is φ = 12162000.

The previous prime is 12161999. The next prime is 12162043. The reversal of 12162001 is 10026121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11048976 + 1113025 = 3324^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 12162001 - 2¹ = 12161999 is a prime.

Together with 12161999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12162061) 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, 6081000 + 6081001.

It is an arithmetic number, because the mean of its divisors is an integer number (6081001).

Almost surely, 2^12162001 is an apocalyptic number.

It is an amenable number.

12162001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12162001 is an equidigital number, since it uses as much as digits as its factorization.

12162001 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 12162001 is about 3487.4060560824. The cubic root of 12162001 is about 229.9684960000.

Adding to 12162001 its reverse (10026121), we get a palindrome (22188122).

It can be divided in two parts, 121 and 62001, that multiplied together give a square (7502121 = 2739²).

The spelling of 12162001 in words is "twelve million, one hundred sixty-two thousand, one".