2311225661 has 2 divisors, whose sum is σ = 2311225662. Its totient is φ = 2311225660.

The previous prime is 2311225639. The next prime is 2311225669. The reversal of 2311225661 is 1665221132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2143134436 + 168091225 = 46294^2 + 12965^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311225661 - 2⁶ = 2311225597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2311225669) 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, 1155612830 + 1155612831.

It is an arithmetic number, because the mean of its divisors is an integer number (1155612831).

Almost surely, 2^2311225661 is an apocalyptic number.

It is an amenable number.

2311225661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311225661 is an equidigital number, since it uses as much as digits as its factorization.

2311225661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 2311225661 is about 48075.2083822837. The cubic root of 2311225661 is about 1322.1501651262.

Adding to 2311225661 its reverse (1665221132), we get a palindrome (3976446793).

The spelling of 2311225661 in words is "two billion, three hundred eleven million, two hundred twenty-five thousand, six hundred sixty-one".