1223661797 has 2 divisors, whose sum is σ = 1223661798. Its totient is φ = 1223661796.

The previous prime is 1223661773. The next prime is 1223661799. The reversal of 1223661797 is 7971663221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1141831681 + 81830116 = 33791^2 + 9046^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223661797 - 2¹⁰ = 1223660773 is a prime.

Together with 1223661799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223661799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611830898 + 611830899.

It is an arithmetic number, because the mean of its divisors is an integer number (611830899).

Almost surely, 2^1223661797 is an apocalyptic number.

It is an amenable number.

1223661797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223661797 is an equidigital number, since it uses as much as digits as its factorization.

1223661797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The square root of 1223661797 is about 34980.8775904779. The cubic root of 1223661797 is about 1069.5977167103.

The spelling of 1223661797 in words is "one billion, two hundred twenty-three million, six hundred sixty-one thousand, seven hundred ninety-seven".