1323696991 has 2 divisors, whose sum is σ = 1323696992. Its totient is φ = 1323696990.

The previous prime is 1323696961. The next prime is 1323697033. The reversal of 1323696991 is 1996963231.

It is a weak prime.

It is an emirp because it is prime and its reverse (1996963231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323696991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323696961) 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, 661848495 + 661848496.

It is an arithmetic number, because the mean of its divisors is an integer number (661848496).

Almost surely, 2^1323696991 is an apocalyptic number.

1323696991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323696991 is an equidigital number, since it uses as much as digits as its factorization.

1323696991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 49.

The square root of 1323696991 is about 36382.6468388434. The cubic root of 1323696991 is about 1097.9844609575.

The spelling of 1323696991 in words is "one billion, three hundred twenty-three million, six hundred ninety-six thousand, nine hundred ninety-one".