1293223661 has 2 divisors, whose sum is σ = 1293223662. Its totient is φ = 1293223660.

The previous prime is 1293223637. The next prime is 1293223663. The reversal of 1293223661 is 1663223921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1032401161 + 260822500 = 32131^2 + 16150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1293223661 is a prime.

It is a Sophie Germain prime.

Together with 1293223663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1293223663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 646611830 + 646611831.

It is an arithmetic number, because the mean of its divisors is an integer number (646611831).

Almost surely, 2^1293223661 is an apocalyptic number.

It is an amenable number.

1293223661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1293223661 is an equidigital number, since it uses as much as digits as its factorization.

1293223661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 1293223661 is about 35961.4190626566. The cubic root of 1293223661 is about 1089.4932585464.

The spelling of 1293223661 in words is "one billion, two hundred ninety-three million, two hundred twenty-three thousand, six hundred sixty-one".