1323064991 has 2 divisors, whose sum is σ = 1323064992. Its totient is φ = 1323064990.

The previous prime is 1323064909. The next prime is 1323065047. The reversal of 1323064991 is 1994603231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1323064991 - 2²⁶ = 1255956127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323064901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661532495 + 661532496.

It is an arithmetic number, because the mean of its divisors is an integer number (661532496).

Almost surely, 2^1323064991 is an apocalyptic number.

1323064991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323064991 is an equidigital number, since it uses as much as digits as its factorization.

1323064991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 1323064991 is about 36373.9603425308. The cubic root of 1323064991 is about 1097.8096886715.

The spelling of 1323064991 in words is "one billion, three hundred twenty-three million, sixty-four thousand, nine hundred ninety-one".