1222201601 has 4 divisors (see below), whose sum is σ = 1222280772. Its totient is φ = 1222122432.

The previous prime is 1222201537. The next prime is 1222201613. The reversal of 1222201601 is 1061022221.

It is a Cunningham number, because it is equal to 34960²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1061022221 = 7 ⋅151574603.

It can be written as a sum of positive squares in 2 ways, for example, as 1048576 + 1221153025 = 1024^2 + 34945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222201601 - 2⁶ = 1222201537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222201601.

It is not an unprimeable number, because it can be changed into a prime (1222201661) 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, 8060 + ... + 50093.

It is an arithmetic number, because the mean of its divisors is an integer number (305570193).

Almost surely, 2^1222201601 is an apocalyptic number.

It is an amenable number.

1222201601 is a deficient number, since it is larger than the sum of its proper divisors (79171).

1222201601 is an equidigital number, since it uses as much as digits as its factorization.

1222201601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79170.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1222201601 is about 34960.0000143021. Note that the first 4 decimals coincide. The cubic root of 1222201601 is about 1069.1720969395.

Adding to 1222201601 its reverse (1061022221), we get a palindrome (2283223822).

The spelling of 1222201601 in words is "one billion, two hundred twenty-two million, two hundred one thousand, six hundred one".