1323123551 has 2 divisors, whose sum is σ = 1323123552. Its totient is φ = 1323123550.

The previous prime is 1323123523. The next prime is 1323123563. The reversal of 1323123551 is 1553213231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323123551 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1323123551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323123251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661561775 + 661561776.

It is an arithmetic number, because the mean of its divisors is an integer number (661561776).

Almost surely, 2^1323123551 is an apocalyptic number.

1323123551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323123551 is an equidigital number, since it uses as much as digits as its factorization.

1323123551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 1323123551 is about 36374.7653050848. The cubic root of 1323123551 is about 1097.8258851011.

Adding to 1323123551 its reverse (1553213231), we get a palindrome (2876336782).

The spelling of 1323123551 in words is "one billion, three hundred twenty-three million, one hundred twenty-three thousand, five hundred fifty-one".