1662322121 has 2 divisors, whose sum is σ = 1662322122. Its totient is φ = 1662322120.

The previous prime is 1662322093. The next prime is 1662322133. The reversal of 1662322121 is 1212232661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1571329600 + 90992521 = 39640^2 + 9539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662322121 - 2¹⁴ = 1662305737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1662322721) 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, 831161060 + 831161061.

It is an arithmetic number, because the mean of its divisors is an integer number (831161061).

Almost surely, 2^1662322121 is an apocalyptic number.

It is an amenable number.

1662322121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662322121 is an equidigital number, since it uses as much as digits as its factorization.

1662322121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 1662322121 is about 40771.5847251490. The cubic root of 1662322121 is about 1184.5999993501.

Adding to 1662322121 its reverse (1212232661), we get a palindrome (2874554782).

The spelling of 1662322121 in words is "one billion, six hundred sixty-two million, three hundred twenty-two thousand, one hundred twenty-one".