1320345623 has 2 divisors, whose sum is σ = 1320345624. Its totient is φ = 1320345622.

The previous prime is 1320345599. The next prime is 1320345641. The reversal of 1320345623 is 3265430231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320345623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320341623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660172811 + 660172812.

It is an arithmetic number, because the mean of its divisors is an integer number (660172812).

Almost surely, 2^1320345623 is an apocalyptic number.

1320345623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320345623 is an equidigital number, since it uses as much as digits as its factorization.

1320345623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 1320345623 is about 36336.5604178491. The cubic root of 1320345623 is about 1097.0570433081.

Adding to 1320345623 its reverse (3265430231), we get a palindrome (4585775854).

The spelling of 1320345623 in words is "one billion, three hundred twenty million, three hundred forty-five thousand, six hundred twenty-three".