1323791999 has 2 divisors, whose sum is σ = 1323792000. Its totient is φ = 1323791998.

The previous prime is 1323791981. The next prime is 1323792013. The reversal of 1323791999 is 9991973231.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9991973231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1323791999 - 2²⁰ = 1322743423 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 1323791999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323791299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661895999 + 661896000.

It is an arithmetic number, because the mean of its divisors is an integer number (661896000).

Almost surely, 2^1323791999 is an apocalyptic number.

1323791999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323791999 is an equidigital number, since it uses as much as digits as its factorization.

1323791999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 53.

The square root of 1323791999 is about 36383.9524928230. The cubic root of 1323791999 is about 1098.0107295101.

The spelling of 1323791999 in words is "one billion, three hundred twenty-three million, seven hundred ninety-one thousand, nine hundred ninety-nine".