12201601 has 4 divisors (see below), whose sum is σ = 12531412. Its totient is φ = 11871792.

The previous prime is 12201599. The next prime is 12201611. The reversal of 12201601 is 10610221.

12201601 = 369² + 370² + ... + 442².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11560000 + 641601 = 3400^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201601 - 2¹ = 12201599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12201611) 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 in 3 ways as a sum of consecutive naturals, for example, 164850 + ... + 164923.

It is an arithmetic number, because the mean of its divisors is an integer number (3132853).

Almost surely, 2^12201601 is an apocalyptic number.

It is an amenable number.

12201601 is a deficient number, since it is larger than the sum of its proper divisors (329811).

12201601 is an equidigital number, since it uses as much as digits as its factorization.

12201601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329810.

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

The square root of 12201601 is about 3493.0790142795. The cubic root of 12201601 is about 230.2178213725.

Adding to 12201601 its reverse (10610221), we get a palindrome (22811822).

The spelling of 12201601 in words is "twelve million, two hundred one thousand, six hundred one".